~/rails811projects$ rails new Fotoalbum
      create  
      create  README.md
…
     run  bundle install --quiet
         run  bundle lock --add-platform=x86_64-linux
Writing lockfile to /home/tpollak/rails811projects/Fotoalbum/Gemfile.lock
Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
       rails  importmap:install
bin/rails aborted!
/snap/ruby/438/lib/ruby/3.4.0/prism.rb:83: warning: already initialized constant Prism::BACKEND
…
/snap/ruby/438/lib/ruby/3.4.0/prism.rb:83: warning: previous definition of BACKEND was here
/snap/ruby/438/lib/ruby/3.4.0/bundled_gems.rb:82:in 'Kernel.require': NameError
    from /snap/ruby/438/lib/ruby/3.4.0/bundled_gems.rb:82:in 'block (2 levels) in Kernel#replace_require'
…
    from bin/rails:4:in '<main>'
<internal:ast>:96:in 'RubyVM::AbstractSyntaxTree.of': cannot get AST for ISEQ compiled by prism (RuntimeError)
    from /snap/ruby/438/lib/ruby/3.4.0/error_highlight/base.rb:59:in 'ErrorHighlight.spot'

How can find out what is missing?

I have been running 24.04 on Wayland for some days successfully. I logged off, selected the xorg graphics system and logged on again . unfortunately at this point the computer crashed and powering on defaults to booting with the xorg graphics system which also crashes. how do I default back to Wayland, as it was in the beginning?

From recovery mode

echo $XDG_SESSION_TYPE

Gives null output

I would like to install Zoom from snap so that it automatically updates every time there is a new release.

I tried to do it from the App Center. Zoom client shows up there, but when I click Install, it asks for authentication, then the original screen comes back, with the green button saying Install - Zoom is not installed.

When I try to install it from the terminal, I get the following error:

sudo snap install zoom-client

Fetch and check assertions for snap "zoom-client" (258) (cannot verify snap "zoom-client", no matching signatures found)

Software icon

Interface in this app

It offers me to update freedesktop and gnome apllication platform

I recently discovered an application called "software" in my system. All the applications I find there are offered to be installed from flathub. Considering that I recently installed Flatpak, I assume this is a Flatpak application. However, I would like to clarify whether this is actually a system application or not. In addition, I often receive notifications suggesting the update of the freedesktop and Gnome application platforms. Is it safe to update them?

Network problems so trying to remove and re-install Samba but get error 'apt-get check failed, you may have broken packages'. How do you clear broken packages? I've tried the suggestions in

How do I fix apt-get check` failed, you may have broken packages but still get same error.

I'm on Ubuntu 24.04 and out of the blue I'm not able to boot my VMs in VirtualBox 7.0. I've uninstalled VirtualBox 7.0 and installed 7.2 via apt, but I still cannot boot VMs what is caused (I guess) by failure to install ExtensionPack with or without sudo.

(sudo) vboxmanage extpack install Oracle_VirtualBox_Extension_Pack-7.2.4.vbox-extpack

0%...NS_ERROR_FAILURE
VBoxManage: error: Failed to install "/home/meme/Downloads/Oracle_VirtualBox_Extension_Pack-7.2.4.vbox-extpack"
VBoxManage: error: The installer failed with exit code 1: VBoxExtPackHelperApp: error: The owner is not root: '/usr'
VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component ExtPackManagerWrap, interface IExtPackManager
VBoxManage: error: Context: "RTEXITCODE handleExtPack(HandlerArg*)" at line 2118 of file VBoxManageMisc.cpp

vboxmanage list extpacks
Extension Packs: 0

Thanks a lot in advance for any help!

I think this should be easy but I am failing to do it and finding much contradictory information around the internet and much that goes back before various aspects of networking were changed. I last did this probably 20 years ago when I remember it being easy but so much has changed that I am going to ask here. Point me elsewhere if this is the wrong place.

I have two laptops: Tux and Juno (may convey their origins!), Tux is my main one and Juno is "fallback". Both are running Kubuntu 25.10 with everything updated daily. Both can use the various wifi networks I use as I move around. I use Tux as a qemu/virtual manager host running another Kubuntu 25.10 guest inside it. (So when things go pear shaped I can just use the backup copy of the guest and not have to reinstall and reconfigure everything.) That's a new set up as of a month or so. What I want is for the two actual machines to be networked through wired ethernet (through a portable "Ubiquiti USW-FLEX-MINI UniFi USW Flex Mini Managed Switch"). With the ethernet wires plugged in I see the status bar connection icon in the guest and it says it's connected and shows tiny amounts of traffic. I don't see icon on host, not sure if that matters or is a function of the host passing it on. Oddly, and worryingly to me, I don't see the icon on the Juno fallback machine.

I had thought I could just set up fixed IPv4 addresses for the ethernet interfaces on both physical machines using private address space not being used by my wifi and, with the right netmask and same network and broadcast addresses, and perhaps having to declare a route I would have an wired network between the machines.
But so much has changed with everything managed by NetworkManager in System Settings now that I'm not passing go.

I had assumed that I might have to do a bit more in the guest/host configuration to enable the guest to see the fallback machine though that's not absolutely vital for me as this is mainly for overnight backups from the guest to the fallback machine done when the guest is down.

I can happily supply more information of course and, cautiously, tweak things, but ...

first edit starts here, replying to comment from vidarlo

Not sure why I lost "but I am worried about messing up a working host/guest machine." OK. Many thanks for helping vidarlo.

"What doesn't work when you simply configure static IP's?"

Sadly, I am not confident of how to do that! That's not helped by not seeing the wired connection icon on the task manager on Juno, the fallback machine and being worried about wrecking things for the Host/Guest pass through on the Tux machine. If you are confident of some instructions that work for [K]ubuntu 25.10 do please point me to them and I will try to follow them.

"What is your configuration like? Please provide output of ip a, ip route when you have it configured statically, ..." I am guessing there is no point in me giving those until I pass go.

"... and tell us what doesn't work." What doesn't work at step #1 for me as far as I am concerned is that the wired connection icon doesn't come up on the Juno machine yet it does on the guest on the other machine. That's not a cable issue as I have swapped the cables over and the situation stays the same. In case it helps ip a on Juno gives:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute
       valid_lft forever preferred_lft forever
2: enp44s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether d4:93:90:2b:90:9d brd ff:ff:ff:ff:ff:ff
    altname enxd493902b909d
3: wlp0s20f3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether c4:3d:1a:d9:6e:71 brd ff:ff:ff:ff:ff:ff
    altname wlxc43d1ad96e71
    inet 192.168.1.13/24 brd 192.168.1.255 scope global dynamic noprefixroute wlp0s20f3
       valid_lft 86105sec preferred_lft 86105sec
    inet6 fe80::e6c0:f94b:ec84:7f5b/64 scope link noprefixroute
       valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:b5:0f:ac brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever 

and ip route gives

default via 192.168.1.1 dev wlp0s20f3 proto dhcp src 192.168.1.13 metric 600
192.168.1.0/24 dev wlp0s20f3 proto kernel scope link src 192.168.1.13 metric 600
192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown

Very happy to do anything more on the fallback machine and get any diagnostics on the host machine. Many thanks, Chris

I'm completely new to Linux and Ubuntu. And I have a problem installing Ubuntu 25.10.

In the installation guides they said I have to shrink one of my drives and Ubuntu chooses this unallocated space to install itself there. But the problem is my Lenovo g-510 has an 8 GB ssd (for I don't exactly know what) and Ubuntu chooses that one for installation instead of that 40 GB of unallocated space that I made for it. Can somebody teach me how to make it choose the 40 GB space?

I have a folder with several PDF, some are plots. I am looking for those that contain a specific string: is it possible to use maybe grep or something to do it?

I recently tried to manually compile and install i3 with the ninja -C build install command, but after trying to run with gdm it crashed.

After that I uninstalled it with ninja -C build uninstall and now I cannot run any X11 desktop, not even GNOME, which I haven't touched.

I have tried to reconfigure the xserver-xorg package with dpkg, but it still doesn't work.

When I run startx from tty3, I get the following error:

xf86EnableIO: failed to enable I/O ports 0000-03ff (Operation not permitted)

Here you have the Xorg log: https://pastebin.com/jQsQf7wR

After startup and typing the password I get a screen about a system mistake on my Xubuntu laptop. I can't see what mistake it is about. Where can I see it? And what to do further? My Xubuntu version: Xubuntu 25.10

This is from a fresh install of Pop!OS and Kubuntu with the latest versions for both. This issue happens with one GPU (OLAND [radeonsi, , ACO, DRM 2.50, 6.16.3-76061603-generic]), but doesn't with a different older one (Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]).

While using my PC, the screen will freeze and then go to a white static screen. On Pop!_OS, I was still able to move my mouse, while Kubuntu completely froze. Here is an example of the issue on Pop!_OS, with the white square being the mouse. After a minute or two, it will reboot itself.

Certain programs seem to trigger it. I've noticed so far Zen Browser and Discord do, and Lutris may have. It's something where if I were to play a game in one monitor and watch a video on the other, Firefox would be fine for hours, but Zen Browser could cause this to happen immediately. For another example if I have Discord open, it seems to happen more randomly.

I could not get this to happen with an installation media (I also verified that it was detecting and using my external GPU). For Kubuntu, I tested it in the same set up with the exact same bootable USB I used to install it, and it didn't happen. I did notice while I was testing with the installation media that this popped up with an error.

I've asked around and it was suggested to me with this error that this could be a bug on Ubuntu's end, but I wanted to ask in case there is a way to fix it (since it seems to be a driver issue).

Here are the specs:

• Processor: AMD® Phenom(tm) ii x6 1035t processor × 6
• GPU: OLAND (radeonsi, , ACO, DRM 2.50, 6.16.3-76061603-generic)
• 24 GB RAM
• 1 TB SSD, and also tested with installing and booting into a 1 TB HDD

I'm brand new to Linux (like one year experience using Pop on a laptop), and I'm sorry if anything here seems a little ignorant. I've reached the ends of what I could Google and so far no one's been able to help me with a solution.

I have Thunderbird 140 and I cannot send or receive mail. I have wiped the computer 3 times and each time it sends and receives about 3 times and then just stops. I have a Intel i7 with 1TB storage and 16GB memory. I tried Evolution, but that wouldn't work either.

I have Ububtu 2403.LTS which came with Thunderbird. I didn't get any e-mails at all, Thunderbird simply checked the smpt and went silent, with no new messages. I checked the message count against my Linux phone which had 4 new messages. Version 140 of Thunderbird is used.

I recently upgraded my laptop to Questing, and now for some reason my Wireguard can no longer connect to my server (Noble Numbat, 24.04.3). I upgraded by running "sudo do-release-upgrade" from the command line.

I have been running WireGuard for a couple of years. I originally installed it following the tutorial on linuxbabe.com, before Ubuntu had a GUI for it. Once I upgraded to Questing, the GUI self-populated... and that's when the problem began.

There are some differences between the GUI and the wg-client0.conf on my laptop. The GUI shows the server at its external IP; wg-client0.conf shows the endpoint at the IP address on my home LAN. In the GUI the Allowed IPs is 0.0.0.0/32, and when I try to change it to 0.0.0.0/0 it automatically reverts to the old value.

I am trying to compile a simple C++ Hello World program to test my environment, however, whenever I try, I get this Error:

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x1b): undefined reference to `main'
collect2: error: ld returned 1 exit status

This is my compiler option: g++ main.cpp -o main

My problem is the following: on the 192.168.1. * network I have 3 machines. I call them U1 (Ubuntu Desktop), US2 (Ubuntu Server), W1(Windows) and a router named R1 in 192.168.1.1. U1 makes and receives response of a ping from W1 and R1. US2 can ping OUTSIDE the local network (and to R1) but receives no responses from W1 or U1. U1 and W1, when they ping US2, they receive no response. All machines access the internet over R1. US2 is updated with "apt update" without any problem. I apologize for the inconvenience and if this topic is trivial, but I have run out of neurons and I have not found an answer. Thank you in advance for your help. (Google translator) I can't insert logs of US2 because he has only user interface within command line, not GUI.

What is the most elegant way to create desktop shortcuts (e.g. to folders, applications, or documents) in Ubuntu 20.04?

I use Thunar instead of Nautilus on Ubuntu 18.04. This works fine, but any application still uses Nautilus instead of Thunar when saving/opening etc or when opening directories/mounted drives from the desktop.

I have already tried running:

xdg-mime default nemo.desktop inode/directory

This had no effect

That possible solution was from this thread:

https://askubuntu.com/a/1043504/953041

Can someone explain what this error means and how i can resolve it please?

update-initramfs: Generating /boot/initrd.img-4.15.0-47-generic
cryptsetup: WARNING: failed to detect canonical device of /dev/nvme0n1p3
cryptsetup: WARNING: could not determine root device from /etc/fstab
W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast
I: The initramfs will attempt to resume from /dev/nvme0n1p4
I: (UUID=868cf117-ffc8-40ae-a29e-128a42a8c1a1)
I: Set the RESUME variable to override this.

Thanks in advance

How to make Firefox in full screen mode while opening it from the Firefox icon? As I need to open a localhost webpage (bookmarked) by default, there's no need for an address bar. I tried F11, AutoFullscreen (addon), but it's not sufficient.

Was thinking of using a joycon as a presenter's clicker. A quick test on my Android phone shows it paired just fine via Bluetooth, though the input is a bit slow and laggy.

However, in 16.10 the Device Search doesn't seem to discover the joycon in sync mode. I've paired bluetooth headphones to this computer successfully, so I don't think it's the hardware. Are there settings or libraries I need to tweak to fix this?

Yesterday I was watching a video on youtube and suddenly my laptop got frozen.
I wasn't able to even move my cursor, so I gave it 10 min and after no response, I pressed the shutdown button for 5 seconds and rebooted my machine.

When it rebooted, it presented me the following screen:

Since than I've been searching the internet for any way to get pass this with absolute no luck.

Bellow I'll leave all the steps I've tried so far:
[First I was having problems enabling networking so these were the steps that helped me:]

• selecting the option Advanced options for Ubuntu

• choosing the option Ubuntu, with Linux 4.4.0-66-generic (recover mode)
• selecting the option Enable networking from the Recovery Menu

• when it finishes and returns to the Recovery Menu, I select the option Drop to root shell prompt

• and then running the following commands with my Ethernet cable plugged in did the trick:

Commands:

/etc/init.d/networking start
echo "nameserver 8.8.8.8" > /etc/resolv.conf

Then I followed this answer referring to this link and repeated the commands for about 10 times each in random order as described in the post:

apt-get update
dpkg --configure -a
apt-get dist-upgrade
apt-get -f install

And I also tried this: answer

cd /etc/dhcp/dhclient-enter-hooks.d
sudo rm debug
sudo ln -s ../debug.dbkg-new debug
cd /etc/dhcp/dhclient-exit-hooks.d
sudo rm debug
sudo ln -s ../debug.dbkg-new debug

After all of that, my machine is still showing the screen in the first image. At this point I don't know what more can I try so I really need some light on this.

Don't know if this is relevant but this is my uname -a:

Linux rm-pc 4.4.0-66-generic #87-Ubuntu SMP Fri Mar 3 15:29:05 UTC 2017 x86_64 x86_64 GNU/Linux

Also when I executed journalctl -xb and this are all the red lines in the code:

I've recently purchased an Asus E202S desktop computer and tried to install Ubuntu 16.04 on it. I had no problems to install or make a dualboot with Windows 10, but the real problems started to show up almost an hour after I've finished the system installation.

Basically, my wifi is periodically "freezing" (The wifi signal shows that everything is ok, but I do not have Internet connection), and I am forced to restart the network-manager. Even after restarting the manager, sometimes my wifi won't show up on the list of available networks or will not work at all. I don't have any of these problems on Windows 10, and also my Internet speed is much faster.

I've been trying to find the problem for almost one week, and here are some of the dozens of cases which seemed to be the closest to mine:

 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1482979
 http://askubuntu.com/questions/730430/wifi-connection-keeps-dropping-in-ubuntu-15-10-rtl8821ae
 https://ubuntuforums.org/showthread.php?t=2245164
 http://askubuntu.com/questions/797213/wireless-disconnect-issues-ubuntu-16-04-with-rtl8821ae
 http://askubuntu.com/questions/730430/wifi-connection-keeps-dropping-in-ubuntu-15-10-rtl8821ae

Even though I could find several people that had the same problem that I'm having, their solutions did not do me any good, and as a newbie ubuntu user, I'm not sure about how I should proceed in this situation.

Problem affects immediately if I uploading information like on Dropbox or via "scp" file transfer. When freezing, ping command answer:

 ping: sendmsg: No buffer space available

My wireless information: https://paste.ubuntu.com/23806837/

Also I've tried:

a.)

  sudo add-apt-repository ppa:hanipouspilot/rtlwifi
  sudo apt-get update
  sudo apt-get install rtlwifi-new-dkms

It makes connection a little bit stable, with this driver I can upload 30-40 mb instead of only 5mb, but after upload freezes again.

b.) If I boot with older kernel (3.19.8) networking is working perfect and two times faster. But!, only in shell because Xorg fail to start on this kernel with error:

 [   113.698] 003f:1bdf: 3F ILLEGAL EXTENDED X86 OPCODE!
 [   113.698] (II) VESA(0): Setting up VESA Mode 0x17F (1366x768)
 [   113.698] 0000:1fcf: 3F ILLEGAL EXTENDED X86 OPCODE!
 [   113.698] (II) VESA(0): VBESetVBEMode failed0000:1fcf: 3F ILLEGAL EXTENDED X86 OPCODE!
 [   113.698]
 [   113.698] (EE)
 Fatal server error:
 [   113.699] (EE) AddScreen/ScreenInit failed for driver 0
 [   113.699] (EE)

Can anyone help me to solve these issues?

I am running tftp-hpa server which was installed as shown below on Ubuntu 15.04

sudo apt-get install tftpd-hpa

The configuration file name tftp-hpa is located in /etc/defaults as shown

 # /etc/default/tftpd-hpa
RUN_DAEMON="yes"
TFTP_USERNAME="tftp"
TFTP_DIRECTORY="/var/lib/tftpboot"
TFTP_ADDRESS="[::]:69"
TFTP_OPTIONS="--secure"

The problem is that I can transfer files from /var/lib/tftpboot only once. In order to perform further transfer I have to issue the restart on the server as follows.

sudo /etc/init.d/tftpd-hpa restart

Failure to issue above command means that the tftpd server no longer respond to any tftp client request.

Any suggestions?

This is probably an easy thing to do but I found no answers while googling for it.

I have unattended-upgrades installed and running successfully for the past few months. It will run again tonight - but I want to run it right now.

Is there a simple command to do so?

I know it is a cron job, ideally it would execute in the same context as it always does

I am running Ubuntu 12.04 LTS, if that helps.

when I try to apt-get update I'm getting the below error,

E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/lib/apt/lists/

I just switched from xmms to Audacious and I'm trying to import the Winamp presets but without success so far. I checked various guides but none of them works. I have a file named eq.preset but If I try to import it to Audacious I get an error:

Error importing Winamp EQF file 'file:///home/edem/winamp_presets'

I think that either this is a bug some people mentioned about Audacious or I'm using the wrong file. It looks like this:

[Presets]
Preset0=(WinAmp) Classical
Preset1=(WinAmp) Club
Preset2=(WinAmp) Dance
Preset3=(WinAmp) Full Bass
Preset4=(WinAmp) Full Bass & Treble
Preset5=(WinAmp) Full Treble
Preset6=(WinAmp) Laptop Speakers / Headphones
Preset7=(WinAmp) Large Hall
Preset8=(WinAmp) Live
Preset9=(WinAmp) Party
Preset10=(WinAmp) Pop
Preset11=(WinAmp) Reggae
Preset12=(WinAmp) Rock
Preset13=(WinAmp) Ska
Preset14=(WinAmp) Soft
Preset15=(WinAmp) Soft rock
Preset16=(WinAmp) Techno

[(WinAmp) Classical]
Preamp=-1.11022e-15
Band0=-1.11022e-15
Band1=-1.11022e-15
Band2=-1.11022e-15
Band3=-1.11022e-15
Band4=-1.11022e-15
Band5=-1.11022e-15
Band6=-7.2
Band7=-7.2
Band8=-7.2
Band9=-9.6

...

Since I'm using a rather new version (3.3.4) I think I'm using a wrong preset file. Can you help me out on this one?

I'm new to Ubuntu; I installed Ubuntu 12.10 and the partitions appear like "30 GB volume" and like "78EF-2C5E" in task bar. I tried to rename it, but the rename and remove buttons are deactivated. So I tried using Disks, but it gives me an error:

(Error setting label: Command-line `mlabel -i "/dev/sdb8" ::"windows"' exited with non-zero exit status 1: Total number of sectors (18550784) not a multiple of sectors per track (63)!
Add mtools_skip_check=1 to your .mtoolsrc file to skip this test
 (udisks-error-quark, 0))

and this also happens to any attached USB to my laptop.

I've installed a version of Java. How can we set the $JAVA_HOME environment variable correctly?

In nautilus and Unity the external drive has a nice short descriptive name "mcat", but all partitions on the 4 internal drives are displayed as a size (834 GB filesystem) or a huge 32-character string form of a GUID:

I'm guessing the external drive is nice, short, sweet and readable because that drive may have no partitions (well, just one I guess) and that name may be the drive label, whereas partitions usually don't have names. That may explain my problem, but doesn't solve it.

Is there some way to give reasonable names to these partitions in nautilus and Unity?