Let me preface this by saying I am new to Linux, only been learning it for a couple of weeks and just did a full install yesterday. Thanks in advance for all the help!

Ubuntu 24.04 LTS. Closing the laptop lid leads to keyboard and mousepad not working.

From a 6 month old post of someone having the same issue, I found the suggestion that the current hibernation mode may interfere with the drivers of the keyboard, and that it can be switched.

I used the information cited in this article to run in terminal:

cat /sys/power/mem_sleep
s2idle [deep]

Since it returned deep as enabled I tried running

sudo echo s2idle > /sys/power/mem_sleep

Terminal returned a permission denied error. After some further research II found this blogpost, and ran as advised

echo 's2idle'| sudo tee /sys/power/mem_sleep

Piping the sudo and tee command seemed to do the trick. I opened the mem_sleep file from the GUI and indeed it displayed

[s2idle] deep

After rebooting, closing and opening the lid of the laptop, hooray! Keyboard was recognized, except! now Ubuntu randomly goes into sleep mode by itself, and of course when it does that the keyboard is no longer recognized. I reverted the changes to the mem_sleep file from a backup, and the pc now behaves as before, so I am left to where I started. The next step I found is this thread which suggests editing Grub, but this is where I start fearing I will break my OS and I'd rather not have to reinstall everything from the beginning. Any help is appreciated!

The TOR applications will not load videos from some web sites. I receive a No video with supported format and MIME type found.

I downloaded from about:support the data sheet from both Linux Mint and Ubuntu. There is a significant difference between the Firefox files. It is my understanding that Ubuntu and Mint change the Firefox App to suit their requirements. I am not a programmer and don't know how these changes effected the TOR App.

Note that the web sites that do not load properly with TOR on Ubuntu do load properly running TOR under Brave. Also used the TOR app on Linux Mint (on this device) and it functions normally. I checked the different web sites and other OS's (on this machine) and various TOR apps. Each one of them works properly on Mint & Ubuntu (except TOR on Ubuntu.)

Bottom line is TOR on the Ubuntu OS does not work properly and it has to be the code that was changed in Firefox. I tried to set up an account on Ubuntu One for days and nothing goes through. Anyone know of another way to contact Ubuntu? According to Ubuntu they were back up and running yesterday.

Thanks for any response. Dennis

I recently installed Ubuntu 26.04 and I noticed that the thumbnails for my comics aren't showing in the file manager. I tried installing different thumbnailers but nothing seem to work. It instead just shows the default ubuntu document icons. Image showing document icons

CPU Architecture: RISCV64
Ubuntu version: 24.04.4
Missing command: libinput, libinput-tools, both are not available at distro.

Getting an error when doing a build from source following the instructions 
at the repository [https://gitlab.freedesktop.org/libinput/libinput/-/releases ] 

Attemp to build it: 
unzip latest file downloaded
meson setup --prefix=/usr builddir/ # in error
ninja -C builddir/                  # pending 
sudo ninja -C builddir/ install     # pending

Conclusion: 
. Modules missing: libgdk-pixbuf2.0-bin, libtiffxx6 and libtiff-dev for architecture RISCV64.

Installation log: 
meson.build:681:12: ERROR: Dependency lookup for gtk+-3.0 with method 'pkgconfig' failed: 
Could not generate cflags for gtk+-3.0:
Package libtiff-4 was not found in the pkg-config search path.
Perhaps you should add the directory containing `libtiff-4.pc'
to the PKG_CONFIG_PATH environment variable
Package 'libtiff-4', required by 'gdk-pixbuf-2.0', not found
Package 'libtiff-4', required by 'gdk-pixbuf-2.0', not found

Search at Ubuntu repo: libtiff-4 is not available, but yes: 
libtiff-dev and libtiff5-dev 

Further erros: 
sudo apt update sudo apt install libtiff-dev

sudo apt install --fix-broken
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Correcting dependencies... Done
The following additional packages will be installed:
  libgdk-pixbuf2.0-bin libtiff-dev libtiffxx6
The following NEW packages will be installed:
  libgdk-pixbuf2.0-bin libtiff-dev libtiffxx6
0 upgraded, 3 newly installed, 0 to remove and 35 not upgraded.
2 not fully installed or removed.
Need to get 719 kB of archives.
After this operation, 4,788 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Ign:1 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libgdk-pixbuf2.0-bin riscv64 2.42.10+dfsg-3ubuntu3.2
Ign:2 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libtiffxx6 riscv64 4.5.1+git230720-4ubuntu2.4
Ign:3 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libtiff-dev riscv64 4.5.1+git230720-4ubuntu2.4
Err:1 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libgdk-pixbuf2.0-bin riscv64 2.42.10+dfsg-3ubuntu3.2
  404  Not Found [IP: 177.128.130.21 80]
Err:2 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libtiffxx6 riscv64 4.5.1+git230720-4ubuntu2.4
  404  Not Found [IP: 177.128.130.21 80]
Err:3 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libtiff-dev riscv64 4.5.1+git230720-4ubuntu2.4
  404  Not Found [IP: 177.128.130.21 80]
E: Failed to fetch http://repo.huaweicloud.com/ubuntu-ports/pool/main/g/gdk-pixbuf/libgdk-pixbuf2.0-bin_2.42.10%2bdfsg-3ubuntu3.2_riscv64.deb  404  Not Found [IP: 177.128.130.21 80]
E: Failed to fetch http://repo.huaweicloud.com/ubuntu-ports/pool/main/t/tiff/libtiffxx6_4.5.1%2bgit230720-4ubuntu2.4_riscv64.deb  404  Not Found [IP: 177.128.130.21 80]
E: Failed to fetch http://repo.huaweicloud.com/ubuntu-ports/pool/main/t/tiff/libtiff-dev_4.5.1%2bgit230720-4ubuntu2.4_riscv64.deb  404  Not Found [IP: 177.128.130.21 80]

--
sudo apt update sudo apt install libtiff-dev 
sudo apt install --fix-broken

sudo apt install libtiff-dev libtiff5-dev 

sudo apt install --fix-broken
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Correcting dependencies... Done
The following additional packages will be installed:
  libgdk-pixbuf2.0-bin libtiff-dev libtiffxx6
The following NEW packages will be installed:
  libgdk-pixbuf2.0-bin libtiff-dev libtiffxx6
0 upgraded, 3 newly installed, 0 to remove and 35 not upgraded.
2 not fully installed or removed.
Need to get 719 kB of archives.
After this operation, 4,788 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Ign:1 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libgdk-pixbuf2.0-bin riscv64 2.42.10+dfsg-3ubuntu3.2
Ign:2 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libtiffxx6 riscv64 4.5.1+git230720-4ubuntu2.4
Ign:3 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libtiff-dev riscv64 4.5.1+git230720-4ubuntu2.4
Err:1 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libgdk-pixbuf2.0-bin riscv64 2.42.10+dfsg-3ubuntu3.2
  404  Not Found [IP: 177

Module not found: libgdk-pixbuf2.0-bin

orangepi@orangepirv2:~/libinput/libinput-1.31.1$ sudo apt install libgdk-pixbuf2.0-bin
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
 libgdk-pixbuf-2.0-dev : Depends: libtiff-dev but it is not going to be installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).
orangepi@orangepirv2:~/libinput/libinput-1.31.1$ sudo apt install libgdk-pixbuf2.0-bin libtiff-dev
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies:
 libtiff-dev : Depends: libtiffxx6 (= 4.5.1+git230720-4ubuntu2.4) but it is not going to be installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).
orangepi@orangepirv2:~/libinput/libinput-1.31.1$ sudo apt install --fix-broken
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Correcting dependencies... Done
The following additional packages will be installed:
  libgdk-pixbuf2.0-bin libtiff-dev libtiffxx6
The following NEW packages will be installed:
  libgdk-pixbuf2.0-bin libtiff-dev libtiffxx6
0 upgraded, 3 newly installed, 0 to remove and 35 not upgraded.
2 not fully installed or removed.
Need to get 719 kB of archives.
After this operation, 4,788 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Ign:1 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libgdk-pixbuf2.0-bin riscv64 2.42.10+dfsg-3ubuntu3.2
Ign:2 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libtiffxx6 riscv64 4.5.1+git230720-4ubuntu2.4
Ign:3 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libtiff-dev riscv64 4.5.1+git230720-4ubuntu2.4
Err:1 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libgdk-pixbuf2.0-bin riscv64 2.42.10+dfsg-3ubuntu3.2
  404  Not Found [IP: 177.128.130.21 80]
Err:2 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libtiffxx6 riscv64 4.5.1+git230720-4ubuntu2.4
  404  Not Found [IP: 177.128.130.21 80]
Err:3 http://repo.huaweicloud.com/ubuntu-ports noble-security/main riscv64 libtiff-dev riscv64 4.5.1+git230720-4ubuntu2.4
  404  Not Found [IP: 177.128.130.21 80]
E: Failed to fetch http://repo.huaweicloud.com/ubuntu-ports/pool/main/g/gdk-pixbuf/libgdk-pixbuf2.0-bin_2.42.10%2bdfsg-3ubuntu3.2_riscv64.deb  404  Not Found [IP: 177.128.130.21 80]
E: Failed to fetch http://repo.huaweicloud.com/ubuntu-ports/pool/main/t/tiff/libtiffxx6_4.5.1%2bgit230720-4ubuntu2.4_riscv64.deb  404  Not Found [IP: 177.128.130.21 80]
E: Failed to fetch http://repo.huaweicloud.com/ubuntu-ports/pool/main/t/tiff/libtiff-dev_4.5.1%2bgit230720-4ubuntu2.4_riscv64.deb  404  Not Found [IP: 177.128.130.21 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
orangepi@orangepirv2:~/libinput/libinput-1.31.1$ 



Support for building the libinput function for RISCV64 is welcome. 

Guy's yesterday I downloaded Lubuntu latest version for the first time ever and it was working completely fine and because I was trying other distros I had to deleted it and now when I installed it back there is an issue that there is black bar on the right and the button of the screen and the left corner is not fully visible knowing that my specs are 4gb ram sata ssd and pentium e5500 with the g41 integrated graphics and the screen resolution is 1366*768. How I can fix the problem and if somebody like faced this problem before and how he fixed it I would really appreciate it

Thank you

Description

Everytime I'm switching from Gnome Desktop to i3wm in my laptop, I get the following error when trying to run Firefox:

$ firefox
Error: cannot open display: :0

So basically:

• Login on Gnome Desktop environment
• Open Firefox here
• Do some stuff, close Firefox and log out
• Login using the same credentials but on i3wm
• Error when trying to open Firefox: Error: cannot open display: :0

Observation

• This also happens the other way (i3wm -> Gnome)
• I doesn't affect other app, only Firefox (I tested with Nautilus and Shotwell)
• I already tried to re login; doesn't solve it
• Content of /etc/X11/xinit/xinitrc:

. /etc/X11/Xsession`

Troubleshooting

Following this answer, I check if X server is running using DISPLAY:

$ echo $DISPLAY
:0

When trying to troubleshoot it, the Xorg display server is also running properly:

$ ps aux | grep "[X]org"
username   85508  2.3  1.0 1487000 77472 tty2    Sl+  17:40   1:06 /usr/lib/xorg/Xorg vt2 -displayfd 3 -auth /run/user/1000/gdm/Xauthority -nolisten tcp -background none -noreset -keeptty -novtswitch -verbose 3

When reading this forum thread, a user asks if I'm

trying to run firefox an a different user

I don't since I already closed the Firefox instance on the Gnome session.

I'm a noob considering window manager but from my understanding after reading this answer from How does Linux's display work? (and especially this picture), the Gnome Desktop Environment and i3wm are both client to the same running display server so there should be no conflict. There's clearly something that I don't get here.

What's the meaning of the error cannot open display: :0 and how can I solve it ?

Environment

• Firefox version: Mozilla Firefox 150.0.1
• OS: Ubuntu 22.04 LTS
• i3: i3 version 4.23-non-git

I installed notepadqq but it fails to run. When running on command line I get this error:

This application failed to start because it could not find or load the Qt platform plugin "wayland-egl".

I then added more debugging information as suggested here: https://stackoverflow.com/a/75338714/639119

This is the expanded debug, in hopes it helps someone else figure out what issue. I personally could not fix this even with the debug:

QFactoryLoader::QFactoryLoader() looking at "/snap/notepadqq/855/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqeglfs.so"
Found metadata in lib /snap/notepadqq/855/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqeglfs.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "eglfs"
        ]
    },
    "className": "QEglFSIntegrationPlugin",
    "debug": false,
    "version": 328961
}


Got keys from plugin meta data ("eglfs")
QFactoryLoader::QFactoryLoader() looking at "/snap/notepadqq/855/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /snap/notepadqq/855/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 328961
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/snap/notepadqq/855/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimal.so"
Found metadata in lib /snap/notepadqq/855/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 328961
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/snap/notepadqq/855/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimalegl.so"
Found metadata in lib /snap/notepadqq/855/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqminimalegl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimalegl"
        ]
    },
    "className": "QMinimalEglIntegrationPlugin",
    "debug": false,
    "version": 328961
}


Got keys from plugin meta data ("minimalegl")
QFactoryLoader::QFactoryLoader() looking at "/snap/notepadqq/855/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqoffscreen.so"
Found metadata in lib /snap/notepadqq/855/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 328961
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/snap/notepadqq/855/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so"
Found metadata in lib /snap/notepadqq/855/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "xcb"
        ]
    },
    "className": "QXcbIntegrationPlugin",
    "debug": false,
    "version": 328961
}


Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/snap/notepadqq/855/usr/local/lib/notepadqq/platforms" ...
This application failed to start because it could not find or load the Qt platform plugin "wayland-egl".

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, xcb.

Reinstalling the application may fix this problem.
Aborted (core dumped)

I want to run both Virtual Machine Manager (virt-manager) and VirtualBox on my Linux PC, however virt-manager uses KVM while VirtualBox uses a different hypervisor. When I try to disable KVM to use VirtualBox, it does not work.

I tried running the following commands:

sudo modprobe -r kvm-intel  
sudo modprobe -r kvm 

...but the KVM modules are still in use and cannot be removed.

My keyboard suddenly started going wonky. It displays the sound key icon that can only be turned off with f2 key. Then I can't copy and paste using ctrl v or type.

I tried changing usb port twice. No effect.

Logging off and rebooting fix temporarily.

Accessibility settings no effect.

I-ve been using a Spanish keyboard with spanish keyboard setting so I changed it to English, temporaily fixed. But it starts again every two minutes and I have to keep changing it from English keyboard back to English.

What is going on and I how do I fix it.

I need help. I'm new to this, but my problem is that when I install Linux Mint on my Lenovo Ideapad laptop, after completing the entire installation, I choose to erase the disk and install Linux Mint,I restarted Linux Mint, removed the USB drive and pressed "enter," but my laptop gets stuck in a constant restart loop, with the message "Restart System" appearing in the upper left corner. I don't know what to do, I've been trying to solve this for hours now, please help :(

Help find a solution to a long term Ubuntu problem on HP devices going erroneously into airplane mode disabling wifi and subsequently stopping any wifi detection. This happens if the device goes into a power save state or the user closes the lid or an inactivity timeout.

Apparently the preferred solution was to use the "sane wifi extension". It's not supported for the latest Ubuntu 26.04 LTS.

Unless anyone else has an alternative solution I would avoid Ubuntu 26.04 LTS. Mint does not have this issue

I've got a bug in my Ubuntu. Taking a screenshot causes the mouse cursor to stick to the screen at its current position, creating a duplicate or ghost image of the cursor. I can use the mouse, but my mouse cursor image is duplicated. If I take three screenshots, three ghost cursors remain stuck on the screen.

I'm new here. I have a problem. On Wayland I can't share my screen in Discord, so I wanted to switch to X11. I didn't have #WaylandEnable=false string in the config file, so I typed it myself. After reboot I have got a login loop. Ok, reinstalled Ubuntu. How to switch Wayland properly? :) GPU - Nvidia GeForce GTX 1660 super. Ubuntu - 26.04 LTS

Using firefox, and attempting to login to Cisco.com with valid credentials, I get stuck on a blank screen listing this URL: https://www.cisco.com/content/cdc/sso/token.html. It never recovers. Able to login using my other computers not running Kubuntu 26.04. Able to login to other websites with no issues... seems isolated to Cisco.com

Kwallet fail to import encrypted files. It does not show the initial wallet. Or if it imports the file, it does not show it as a new wallet. Deleting a wallet is also failing.

I want to upgrade my desktop pc - currently running ubuntu 24.04 - to the latest version 26.04. I created a bootable usb drive with the latest iso image. When booting into the USB disk, I get the following error: spi-nor spi0.0: probe NovaCore unsupported chipset: boot 42 = 0x124a1002 (architecture 0x12, implementation 0x4). The installation stalls.

Hardware
========
Model: MSI MS-7817
Memory: 16.0 GiB 
Processor: Intel® Core™ i7-4790 × 8
Graphics: NVIDIA GeForce GTX 970
Disk Capacity: 2.0 TB (SSD)

H/W path             Device     Class          Description
==========================================================
system         MS-7817 (To be filled by O.E.M.)
/0                              bus            H81M-E34 (MS-7817)
/0/0                            memory         64KiB BIOS
/0/3d                           processor      Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz
/0/3d/3e                        memory         1MiB L2 cache
/0/3d/3f                        memory         256KiB L1 cache
/0/3d/40                        memory         8MiB L3 cache
/0/41                           memory         16GiB System Memory
/0/41/0                         memory         8GiB DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
/0/41/1                         memory         DIMM [empty]
/0/41/2                         memory         8GiB DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
/0/41/3                         memory         DIMM [empty]
/0/100                          bridge         4th Gen Core Processor DRAM Controller
/0/100/1                        bridge         Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller
/0/100/1/0           /dev/fb0   display        GM204 [GeForce GTX 970]
/0/100/1/0.1         card1      multimedia     GM204 High Definition Audio Controller
/0/100/1/0.1/0       input15    input          HDA NVidia HDMI/DP,pcm=3
/0/100/1/0.1/1       input16    input          HDA NVidia HDMI/DP,pcm=7
/0/100/1/0.1/2       input17    input          HDA NVidia HDMI/DP,pcm=8
/0/100/1/0.1/3       input18    input          HDA NVidia HDMI/DP,pcm=9
/0/100/14                       bus            8 Series/C220 Series Chipset Family USB xHCI
/0/100/14/0          usb1       bus            xHCI Host Controller
/0/100/14/0/1                   input          USB Receiver
/0/100/14/0/1/0      input14    input          Logitech M280/320/275
/0/100/14/0/2        input6     input          Primax Electronics, Ltd HP Wireless Keyboard Mouse Kit
/0/100/14/1          usb3       bus            xHCI Host Controller
/0/100/16                       communication  8 Series/C220 Series Chipset Family MEI Controller #1
/0/100/1a                       bus            8 Series/C220 Series Chipset Family USB EHCI #2
/0/100/1a/1          usb2       bus            EHCI Host Controller
/0/100/1a/1/1                   bus            Integrated Rate Matching Hub
/0/100/1b            card0      multimedia     8 Series/C220 Series Chipset High Definition Audio Controller
/0/100/1b/0          input19    input          HDA Intel PCH Rear Mic
/0/100/1b/1          input20    input          HDA Intel PCH Front Mic
/0/100/1b/2          input21    input          HDA Intel PCH Line
/0/100/1b/3          input22    input          HDA Intel PCH Line Out
/0/100/1b/4          input23    input          HDA Intel PCH Front Headphone
/0/100/1c                       bridge         8 Series/C220 Series Chipset Family PCI Express Root Port #1
/0/100/1c.2                     bridge         8 Series/C220 Series Chipset Family PCI Express Root Port #3
/0/100/1c.2/0        enp3s0     network        RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet Controller
/0/100/1c.5                     bridge         8 Series/C220 Series Chipset Family PCI Express Root Port #6
/0/100/1c.5/0                   bus            VL805/806 xHCI USB 3.0 Controller
/0/100/1c.5/0/0      usb5       bus            xHCI Host Controller
/0/100/1c.5/0/0/1               bus            USB2.0 Hub
/0/100/1c.5/0/0/1/4             communication  Bluetooth Dongle (HCI mode)
/0/100/1c.5/0/1      usb6       bus            xHCI Host Controller
/0/100/1d                       bus            8 Series/C220 Series Chipset Family USB EHCI #1
/0/100/1d/1          usb4       bus            EHCI Host Controller
/0/100/1d/1/1                   bus            Integrated Rate Matching Hub
/0/100/1f                       bridge         H81 Express LPC Controller
/0/100/1f/0                     system         PnP device PNP0c01
/0/100/1f/1                     system         PnP device PNP0c02
/0/100/1f/2                     system         PnP device PNP0b00
/0/100/1f/3                     system         PnP device PNP0c02
/0/100/1f/4                     communication  PnP device PNP0501
/0/100/1f/5                     system         PnP device PNP0c02
/0/100/1f/6                     system         PnP device PNP0c02
/0/100/1f.2          scsi0      storage        8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode]
/0/100/1f.2/0        /dev/sda   disk           1TB Samsung SSD 870
/0/100/1f.2/0/1      /dev/sda1  volume         1023KiB BIOS Boot partition
/0/100/1f.2/0/2      /dev/sda2  volume         931GiB EXT4 volume
/0/100/1f.2/1        /dev/sdb   disk           1TB Samsung SSD 860-
/0/100/1f.2/1/1      /dev/sdb1  volume         931GiB EXT4 volume
/0/100/1f.3                     bus            8 Series/C220 Series Chipset Family SMBus Controller
/1                              power          To Be Filled By O.E.M.
/2                   input0     input          Power Button
/3                   input1     input          Power Button

Yesterday I deleted some software I had installed to play some games (to no avail). Including wine and winetricks.

Today, when I tried to boot my computer, it just didn't work. I took photos of what the messages are.

         Starting GRUB failed boot detection...
         Starting Hold until boot process finishes up...
         Starting Hostname Service...
[  OK  ] Started Power Profiles daemon.
[  OK  ] Started Switcheroo Control Proxy service.
         Starting Save/Restore Sound Card State...
[  OK  ] Stopped epson custom backend daemon.
[FAILED] Failed to start epson custom backend daemon.
See 'systemctl status ecbd.service' for details.
[  OK  ] Finished GRUB failed boot detection.
[  OK  ] Finished Save/Restore Sound Card State.
[  OK  ] Reached target Sound Card.
[  OK  ] Started Apache Tomcat 9 Web Application Server.
         Starting Manage, Install and Generate Color Profiles...
[  OK  ] Started Accounts Service.
[  OK  ] Started Manage, Install and Generate Color Profiles.
[  OK  ] Started GNOME Display Manager.
[  OK  ] Started User Login Management.
[  OK  ] Started Modem Manager.
[  OK  ] Stopped epson custom backend daemon.
[FAILED] Failed to start epson custom backend daemon.
See 'systemctl status ecbd.service' for details.
[  OK  ] Started Unattended Upgrades Shutdown.
[  OK  ] Started Disk Manager.
_

The first picture is where my computer is stuck (for at least 15 minutes).

Then I tried the recovery mod and to repair broken dependencies (dpkg). It didn't work. I then understood I needed to activate the network. The dpkg did work more, but at some point said it couldn't go further and just stopped the processes and went back.

The last picture was when I got the computer to shut down after all this. First I just had a black screen, then I pressed the power button. It started to show lines rather quickly (that's the last picture), and then itshut down.

I also tried to boot on my USB flash drive (with Ubuntu 18.04), but I didn't manage to actually see my two other drives, so I'm rather lost on what I can do to solve this problem.

I wouldn't mind just scrap everything and reinstall, but first I'd need to save my data. I'm not sure how I could do it in this state.

Does anyone have an idea about how I could do it?

Happy Sunday everyone!

A fresh install of 26.04 is working brilliantly, and the CPU and GPU-related improvements are proving to be a welcome speed/quality upgrade to my system. However...

I use the default [Rygel] media sharing to watch videos on my TV simply by dropping them into my Videos folder on Ubuntu, and it was working fine in 24.04. However, I noticed that since my fresh install of 26.04 my .mkv videos are no longer served and do not appear in VLC local network discovery on both my TV and mobile.

The root cause is Gstreamer, which Rygel uses, unable to decipher .mkv files anymore; all other formats, e.g. MP4, are fine and I can see and play them. The error comes up as either 'unsupported pixel format' or 'failed to configure the buffer pool' depending which .mkv file I try. In case this problem was Rygel-specific, I installed the [now default] Showtime app, which is also Gstreamer-based, and sure enough, that comes back with 'unable to play video' on .mkv files with the detailed error being Gstreamer with the same two errors as above.

Please could someone confirm this bug for me? The easiest way is just to try to play any .mkv video using Showtime. I have restricted extras installed and all other codec/video libraries including good, bad and ugly. It would be interesting to hear from someone who does not have my ARM-based (Raspberry Pi 5) system to make sure it is not specific to the RPi5-specific build of 26.04.

Many thanks in advance

Nick

As requested by https://askubuntu.com/users/1004020/daniel-t (thank you):

$ dpkg --get-selections | grep gstreamer
gir1.2-gstreamer-1.0:arm64            install
gstreamer1.0-alsa:arm64                install
gstreamer1.0-gl:arm64                install
gstreamer1.0-gtk3:arm64                install
gstreamer1.0-gtk4:arm64                install
gstreamer1.0-libav:arm64            install
gstreamer1.0-packagekit                install
gstreamer1.0-pipewire:arm64            install
gstreamer1.0-plugins-bad:arm64            install
gstreamer1.0-plugins-base:arm64            install
gstreamer1.0-plugins-base-apps            install
gstreamer1.0-plugins-extra:arm64        install
gstreamer1.0-plugins-good:arm64            install
gstreamer1.0-plugins-ugly:arm64            install
gstreamer1.0-tools                install
gstreamer1.0-x:arm64                install
libgstreamer-gl1.0-0:arm64            install
libgstreamer-plugins-bad1.0-0:arm64        install
libgstreamer-plugins-base1.0-0:arm64        install
libgstreamer-plugins-extra1.0-0:arm64        install
libgstreamer1.0-0:arm64                install

In case it helps, these are the errors from opening two different .mkv files in Showtime video player (Gstreamer-based):

Error from element /GstPlayBin3:playbin3/GstURIDecodeBin3:uridecodebin3/GstDecodebin3:decodebin3-0/v4l2slh265dec:v4l2slh265dec0: GStreamer error: negotiation problem.
Unsupported pixel format
../sys/v4l2codecs/gstv4l2codech265dec.c(460): gst_v4l2_codec_h265_dec_negotiate (): /GstPlayBin3:playbin3/GstURIDecodeBin3:uridecodebin3/GstDecodebin3:decodebin3-0/v4l2slh265dec:v4l2slh265dec0:
No support for 3840x2160 format UNKNOWN

Error from element /GstPlayBin3:playbin3/GstURIDecodeBin3:uridecodebin3/GstDecodebin3:decodebin3-0/v4l2slh265dec:v4l2slh265dec0: Could not get/set settings from/on resource.
Failed to configure the buffer pool
../gst-libs/gst/video/gstvideodecoder.c(4373): gst_video_decoder_decide_allocation_default (): /GstPlayBin3:playbin3/GstURIDecodeBin3:uridecodebin3/GstDecodebin3:decodebin3-0/v4l2slh265dec:v4l2slh265dec0:
Configuration is most likely invalid, please report this issue.

Output of ffmpeg:

Input #0, matroska,webm, from 'test video 1080p.mkv':
  Metadata:
    creation_time   : 2026-04-27T14:41:20.000000Z
    ENCODER         : Lavf62.3.100
  Duration: 01:41:46.75, start: -0.021000, bitrate: 2017 kb/s
  Stream #0:0: Video: hevc (Main), 1 reference frame, yuv420p(tv, bt709, left), 1918x1040 [SAR 1:1 DAR 959:520], 23.98 fps, 23.98 tbr, 1k tbn (default)
    Metadata:
      DURATION        : 01:41:39.719000000
  Stream #0:1(eng): Audio: aac (LC), 48000 Hz, 5.1, fltp, delay 1024, start -0.021000 (default)
    Metadata:
      title           : AAC 5.1 320kbs
      DURATION        : 01:41:46.752000000
  Stream #0:2(eng): Subtitle: subrip (srt), start -0.021000
    Metadata:
      title           : English
      DURATION        : 01:34:33.417000000
[out#0/null @ 0xaaaad3d17ba0] No explicit maps, mapping streams automatically...
[vost#0:0/wrapped_avframe @ 0xaaaad3df5840] Created video stream from input stream 0:0
Device creation failed: -14.
[vist#0:0/hevc @ 0xaaaad3df53e0] [dec:hevc @ 0xaaaad3dfe320] No device available for decoder: device type drm needed for codec hevc.
[vist#0:0/hevc @ 0xaaaad3df53e0] [dec:hevc @ 0xaaaad3dfe320] Hardware device setup failed for decoder: Bad address
Error opening output file -.
Error opening output files: Bad address
[AVIOContext @ 0xaaaad3d18f50] Statistics: 32768 bytes read, 0 seeks

Exiting with exit code -14

Output from dmesg:

$ sudo dmesg | grep hevc ; for codec in H264 H265 MPG2 WVC1 MPG4 MJPG WMV9 ; do echo -e "$codec:\t$(vcgencmd codec_enabled $codec)" ; done ; vcgencmd get_mem arm ; vcgencmd get_mem gpu ; vcgencmd get_config int
[    5.409842] rpi-hevc-dec 1000800000.codec: Device registered as /dev/video19
H264:   Can't open device file: /dev/vcio
Try creating a device file with: sudo mknod /dev/vcio c 100 0
H265:   Can't open device file: /dev/vcio
Try creating a device file with: sudo mknod /dev/vcio c 100 0
MPG2:   Can't open device file: /dev/vcio
Try creating a device file with: sudo mknod /dev/vcio c 100 0
WVC1:   Can't open device file: /dev/vcio
Try creating a device file with: sudo mknod /dev/vcio c 100 0
MPG4:   Can't open device file: /dev/vcio
Try creating a device file with: sudo mknod /dev/vcio c 100 0
MJPG:   Can't open device file: /dev/vcio
Try creating a device file with: sudo mknod /dev/vcio c 100 0
WMV9:   Can't open device file: /dev/vcio
Try creating a device file with: sudo mknod /dev/vcio c 100 0
Can't open device file: /dev/vcio
Try creating a device file with: sudo mknod /dev/vcio c 100 0
Can't open device file: /dev/vcio
Try creating a device file with: sudo mknod /dev/vcio c 100 0
Can't open device file: /dev/vcio
Try creating a device file with: sudo mknod /dev/vcio c 100 0

Latest results using H265 mkv:

Input #0, matroska,webm, from 'video-h265.mkv':
  Metadata:
    ENCODER         : Lavf55.12.0
  Duration: 00:00:16.16, start: 0.099000, bitrate: 2619 kb/s
  Stream #0:0: Video: hevc (Main), 1 reference frame, yuv420p(tv, bt709, left), 1920x960 [SAR 1:1 DAR 2:1], 25 fps, 25 tbr, 1k tbn, start 0.120000 (default)
  Stream #0:1(eng): Audio: aac (LC), 48000 Hz, stereo, fltp, start 0.099000 (default)
    Metadata:
      title           : Stereo
      LANGUAGE        : eng
[out#0/null @ 0xaaaaf4dceb20] No explicit maps, mapping streams automatically...
[vost#0:0/wrapped_avframe @ 0xaaaaf4e01790] Created video stream from input stream 0:0
Device creation failed: -14.
[vist#0:0/hevc @ 0xaaaaf4dfd030] [dec:hevc @ 0xaaaaf4e02570] No device available for decoder: device type drm needed for codec hevc.
[vist#0:0/hevc @ 0xaaaaf4dfd030] [dec:hevc @ 0xaaaaf4e02570] Hardware device setup failed for decoder: Bad address
Error opening output file -.
Error opening output files: Bad address
[AVIOContext @ 0xaaaaf4dd2ed0] Statistics: 182748 bytes read, 0 seeks

Exiting with exit code -14

nicholas@nostromo:~/Downloads$ sudo vcgencmd get_mem gpu
gpu=8M

nicholas@nostromo:~/Downloads$ sudo vcgencmd get_config int
arm_64bit=1
arm_freq=2400
arm_freq_min=1500
arm_peri_high=1
audio_pwm_mode=2
avs_temp=19144
camera_auto_detect=1
core_freq=910
core_freq_min=500
disable_commandline_tags=2
disable_fw_kms_setup=1
disable_l2cache=1
disable_overscan=1
display_auto_detect=1
display_default_lcd=-1
display_hdmi_rotate=-1
display_lcd_rotate=-1
dvfs=4
enable_gic=1
force_eeprom_read=1
force_ethernet_phy_address=-1
force_pwm_open=1
framebuffer_depth=16
framebuffer_ignore_alpha=1
framebuffer_swap=1
gpu_freq_min=500
hdmi_enable_4kp60=1
hevc_freq=910
hevc_freq_min=500
ignore_lcd=-1
init_uart_clock=0x2dc6c00
initial_turbo=60
isp_freq=910
isp_freq_min=500
mask_gpu_interrupt1=16418
max_framebuffers=1
over_voltage_avs=0x1b8a0
pause_burst_frames=1
pciex4_reset=1
pmic_turbo_threshold=1500
power_force_3v3_pwm=1
program_serial_random=1
ramfsaddr=-1
total_mem=16384
usb_max_current_enable=1
v3d_freq=960
v3d_freq_min=500
vpred=8728
vpred_max=8728
hdmi_force_cec_address:0=65535
hdmi_force_cec_address:1=65535

I'm a beginner. I'm using a Galaxy Book2 Pro 5G with Ubuntu 26.04 installed. The known problem is that there's no sound from the speakers, but there is sound when I plug in headphones. There's very little information about this online.

i did some basic tweak for supressing the Wayland Display, but could not set to x11.

Can someone post how i can disable Wayland and continue on X11 i haev some apps that dont support Wayland.

The default Super + something keyboard shortcuts don't work on my live session and even if I try to change it to some other shortcut key combination even not containing Super key, I can't get it work. No Super key combinations work in Window Manager settings, but some work in Keyboard settings. And Whisker Menu can be started by mere Super key release. Resetting to defaults didn't help.

I have an Ubuntu 24.04.3 machine I use as a media server. I'm trying to get RDP to work consistently from my windows 11 desktop, but I've not had much luck.

Initially i have it set up through settings > system > remote desktop, with both desktop sharing and remote login enabled, with user name and password configured.

On my Windows PC I connect using the username and password to the IP over port 3390. This works at first, but I noticed that if I'm not already logged into a session or if the set screen off/logout time occurs I can no longer RDP - unless I physically go into my Ubuntu OS and log in again.

Is there a setup step I'm missing, or would another solution work better for me?

I have a new installation of Ubuntu 22.04, and switched to LXQt using apt install task-lxqt-desktop. Now my 4K screen shows huge text for the LXQt applications (Qt applications?). I want the text to be similar in pixel size as the other applications like Firefox and the window titles.

What do I need to change to have them rendered similar to the firefox text?

(left == bad, right == good :) )

Changing DPI setting did not have any visible effect; changing QT_SCALE_FACTOR to 2 made it worse, and 0.5 broke my UI :) - note to self: don't go below 1.0).

I apt-get removed default CMake and build CMake from source and installed the new version into /usr/local . But the cmake comannd does not works.

I've tried following commands:

$ source ~/.bashrc
$ sudo ldconfig
$ which cmake
/usr/local/bin/cmake
$ /usr/local/bin/cmake --version
cmake version 3.18.4
$ cmake --version
-bash: /usr/bin/cmake: No such file or directory

I can create a soft link /usr/bin/cmake to /usr/local/bin/cmake , but I'm curious about why the cmake command obstinately point to the former?

Additional Information:

$ dpkg -l | grep cmake
rc  cmake-data  3.10.2-1ubuntu2.18.04.1  all  CMake data files (modules, templates and documentation)

$ apt-cache policy cmake
cmake:
  Installed: (none)
  Candidate: 3.10.2-1ubuntu2.18.04.1
  Version table:
     3.10.2-1ubuntu2.18.04.1 500
        500 http://[INTRANET]/ubuntu bionic-updates/main amd64 Packages
     3.10.2-1ubuntu2 500
        500 http://[INTRANET]/ubuntu bionic/main amd64 Packages

which [INTRANET] is a private source of a company.

I'm a newbie to ubuntu and was trying to uninstall dash to dock as I don't need it. I uninstalled it using sudo apt remove gnome-shell-extension-ubuntu-dock and the dock still showed up in activities overview. Then I found someone used to sudo apt purge gnome-shell-extension-ubuntu-dock to resolve the issue. I tried, still no luck. And now this big dock shows up in activities overview.

It would also be helpful if somecan can help me get the dock back to normal!

Note: I'm on Ubuntu 20.04

Any Help Would be Appreciated!

For example, libelf1 has duplicate package meta data, i.e.

$ apt-cache show libelf1 | grep 'Architecture:'
Architecture: amd64
Architecture: amd64

Why is that?

I'm using Ubuntu 14.04. I recently installed Android Studio, but whenever I try to run a Hello World app, I get this error:

/home/praveen/Android/Sdk/tools/emulator -avd Nexus_6_API_21 -netspeed full -netdelay none
emulator: ERROR: x86 emulation currently requires hardware acceleration!
Please ensure KVM is properly installed and usable.
CPU acceleration status: KVM is not installed on this machine (/dev/kvm is missing).

The drawing mode provided by zoomit is wonderful during a presentation. Is there any software on Ubuntu that provides the same functionality?

I need a good CAD program for mechanical engineering.
Are there any good 3D CAD programs available for Ubuntu like Autocad?

I use Torrents often, so I need to know how to make my computer start up and shut down automatically, Wi-Fi is switched on at six in the morning in my hotel and switched off at two AM. (I am able to schedule torrents, that's not a problem), I don't want my computer always plugged in to a power supply.