Why pkg-config --variable=udevdir udev provides nothing on Ubuntu 26? Full code

sudo apt-get update 
sudo apt-get install libudev-dev
pkg-config --variable=udevdir udev

I have been running Ubuntu with an Ubuntu desktop for years. I had a sidebar with about 8 icons I chose, but no icons cluttering up the desktop itself; I launch everything else from the command line. However, a few days ago after a spontaneous installation of new software, the Ubuntu desktop has a icon for every file in my home area.
All the answers I have seen, either they do not work or I do not understand them (e.g.select from Menu - what menu?). Please can anyone explain how to hide all the desktop icons, starting from the terminal with all commands I need, or some setting I have missed in Settings? Thanks.

PS I am currently using the Gnome desktop option but it does not have a sidebar I can add a few icons to and it is less convenient for switching or moving terminals etc. between desktops.

I have a windows drive mounted using dislocker. I added one of its folders to the search providers in Gnome preferences and checked Files (nautilus). Some files inside that folder can be found using Gnome search, others cannot, and I am unable to spot any difference between those. It looks like Gnome indexes that drive only partially.

I tried the localsearch command. It finds all files very well, but I am not sure this is what nautilus uses internally.

Is this a known issue?

I'm running UBUNTU 26.04 LTS. To install the code VESTA (molecular viewer) system inform me that it needs libjavascriptcoregtk-4.0.so.18. How I can proceed?

System setup:

• OS: Ubuntu Desktop (GNOME).

• Custom Shortcuts: I have swapped the default behavior. My Alt + Tab is set to "Switch Windows" and my Win + Tab is set to "Switch Applications."

Even though I have enabled the workspace restriction in the settings, windows from other workspaces are still appearing in my switcher.

• Current Settings: In Settings > Multitasking, I have already selected the option "Include apps from the current workspace only" under the Application Switching section.

• Example Scenario: I have two Brave browser windows open. One is on Workspace 1 (showing website ABC) and the other is on Workspace 2* (showing website XYZ).

• The Bug: When I am on Workspace 1 and press Alt + Tab, the switcher still shows both the ABC and XYZ windows, even though XYZ belongs to a different workspace.

I need a way to ensure that Alt + Tab (switch windows) strictly respects the workspace I am currently on and does not "pull in" windows of the same application from other workspaces.

The latest upgrade few days ago broke my desktop private key loading stack, in the sense that I have a passphrase protected private key, and I am used to SSH login to other sites with that key. The "normal behaviour" is that after any reboot Gnome ask your host password and somehow with that password it can open the private key and the SSH works normally. Now, I still have the pop-up asking my user/host password (not the passphrase), but the SSH login attempt just do nothing. I need to manually add the key with ssh-add ~/.ssh/id_rsa, and then it works.

Am I the only one with this strange behaviour ? Any workaround to get it back that the login "open automatically" the private key ?

Without nomodeset it boots to a black screen. I have an HP laptop with an AMD Ryzen 5 5500U with Radeon Graphics. I tried with amdgpu.dc =0, I checked the amdgpu drivers, and I reinstalled the firmware, but none of them solved the problem. Edit: I'm using Ubuntu Desktop 26.04LTS From the very beginning since I installed the system I have needed nomodeset

Please excuse me if this question is a duplicate, but I cannot find the other one I thought I published two days ago.

I'm running Ubuntu 24.04 and getting my video output from an NVIDIA RTX 2000 ADA. Everything seems to work fine except the App Center who shows tearing and artifacts as per the attached picture.

I already enabled "Force Full Composition Pipeline" in NVIDIA XSERVER SETTINGS and that changed nothing.

Any suggestions?

Estoy tratando de instalar Linux Mint de 32 bits en una laptop muy viejita, Toshiba Atom con pantalla de 10", muy chica. El problema radica en que no puedo ver los Botones de Atras o Continuar. Ya probe con Tab, con Return, con el Mouse,etc. pero no puedo seguir. Esto ya lo hice en naquinas de 15 o 16" sin problema, el asunto es el tama#o de la pantalla. Alguien tiene idea de como resolver esto?

Gracias.

Up through release 24.04, when I look at a list of files on an NFS mount using the ls -l command, I see the permissions then the number of hard links, then owner . . .

On 26.04 When I look at a similar list of files on an NFS mount using the ls -l command, I see a plus (+) sign after the permissions.

I found some discussion of the plus sign at the spot meaning there were additional attributes which could be viewed with the getfacl command. On both 24.04 where there isn't a plus to the right of permissions as well as on 26.04, where I do see the + to the right of the permissions, in both cases getfacl shows no additional information, just

# file:
# owner:
# group:
user::rw-
group::rw-
other::r--

So why does 24.04 show -rw-rw-r-- yet 26.04 shows -rw-rw-r--+

Interesting, in 26.04 (as per a comment here) gnuls -l gives the same result as ls -l in 24.04. gnuls is not found in my Xbuntu 24.04 system.

Perhaps this is a change to the ls command as of 26.04?

I previously had Ondrej NGINX installed, but needed to remove it, as per this question:

Unable to remove Ondrej NGINX

Then I followed the official NGINX installation notes here:

https://nginx.org/en/linux_packages.html#Ubuntu

But there is still an error when I run apt update:

E: The repository 'https://ppa.launchpadcontent.net/nginx/stable/ubuntu noble Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

I checked and the nginx.list file is there and has the correct contents. Why would there still be an update error?

I also tried the suggestion with the nginx.sources file at:

Missing Release file for NGINX PPA on Ubuntu 24.04 Noble

But upon running apt update the following error is produced instead:

E: Conflicting values set for option Signed-By regarding source https://nginx.org/packages/ubuntu/ noble: /usr/share/keyrings/nginx-archive-keyring.gpg != /etc/apt/keyrings/nginx-archive-keyring.gpg
E: The list of sources could not be read.

I have no idea where the /usr/share/keyrings/nginx-archive-keyring.gpg reference is coming from. The file just contains the following:

Types: deb
URIs: http://nginx.org/packages/ubuntu
Suites: noble
Components: nginx
Architectures: amd64
Signed-By: /etc/apt/keyrings/nginx-archive-keyring.gpg

I have a drawing tablet (Huion H430P) that I use with the OpenTabletDriver. After stopping moving the cursor with the tablet, the ubuntu tiling stops working and an extra cursor appears in the top left corner. Here is a link to the video I uploaded to streamable showing the bug: https://streamable.com/e8z60y

Linux: Ubuntu 24.04.4, built for riscv64

Error: Pen pointer not moving X,Y in Wayland   
Missing driver: input-wacom  
Instructions: <https://github.com/linuxwacom/input-wacom/wiki/Installing-input-wacom-from-source>  
Linux uname -r: 6.6.63-ky

Error at build: We could not find the development environment to build modules for the '6.6.63-ky' kernel within the '' directory.  
  
./configure  
...  
checking for linux-based kernel... yes  
checking for kernel source/headers... not found  
configure: WARNING: Unable to find build config in any of:  
      \[/lib/modules/6.6.63-ky/source\],  
      \[/lib/modules/6.6.63-ky/build\],  
      \[/usr/src/linux\],  
      \[/usr/src/linux-6.6.63-ky\]   
  
configure: WARNING: Kernel directory does not appear to have needed config files  
checking kernel version...   
configure: WARNING: Spcified '6.6.63-ky' kernel, but found '' instead  
configure: error: We could not find the development environment to build modules for the '6.6.63-ky' kernel within the '' directory. Please install the kernel source or the kernel development package and try again  

Debug of available Header Files:

orangepi@orangepirv2:/lib/modules/6.6.63-ky  
$ ls -l  
total 1152  
drwxr-xr-x 7 root root   4096 Mar 11  2025 kernel  
\-rw-r--r-- 1 root root 289971 Mar 11  2025 modules.alias  
\-rw-r--r-- 1 root root 292158 Mar 11  2025 modules.alias.bin  
\-rw-r--r-- 1 root root  23702 Mar 11  2025 modules.builtin  
\-rw-r--r-- 1 root root  48728 Mar 11  2025 modules.builtin.alias.bin  
\-rw-r--r-- 1 root root  25164 Mar 11  2025 modules.builtin.bin  
\-rw-r--r-- 1 root root 141176 Mar 11  2025 modules.builtin.modinfo  
\-rw-r--r-- 1 root root  48701 Mar 11  2025 modules.dep  
\-rw-r--r-- 1 root root  74483 Mar 11  2025 modules.dep.bin  
\-rw-r--r-- 1 root root    121 Mar 11  2025 modules.devname  
\-rw-r--r-- 1 root root  23279 Mar 11  2025 modules.order  
\-rw-r--r-- 1 root root    601 Mar 11  2025 modules.softdep  
\-rw-r--r-- 1 root root  81845 Mar 11  2025 modules.symbols  
\-rw-r--r-- 1 root root 100961 Mar 11  2025 modules.symbols.bin  

Could you please assist how to build and install the kernel driver for Wacom Inutos tablet and Stylus pen.

"Open in Terminal" in Nemo does nothing because it is set to use xfce4-terminal which is not installed. I found out that the terminal to use can be changed with:

gsettings set org.cinnamon.desktop.default-applications.terminal exec ptyxis

The problems are: 1. If a ptyxis terminal window already is open, I'm only getting a notification like "Terminal {current terminal path} is ready" but nothing else. The terminal path is not changed and the window is not raised if hidden or minimized. 2. If no terminal window is open, a new window opens but it is always in my last used path, not the path from Nemo.

How can I set Nemo to open a new ptyxis window or tab using the path from Nemo?

I have a computer running Ubuntu 24.04 LTS desktop where I have QEMU/KVM running. One of the guest OS is Windows 11. This VM has secure-boot on as required by Windows. The secure boot certificates originally issued in 2011 will expire next month. The new certificates were issued in 2023.

It looks like my VM is not using the new certificates. When I check the secure boot status from within Windows guest, it says:

Secure boot is on, but your device is using an older boot trust configuration that should be updated. There is not yet enough data to classify your device for automatic update.

The XML tab of the Overview section of the Virtual Machine Manager shows in part:

    <loader readonly="yes" secure="yes" type="pflash">/usr/share/OVMF/OVMF_CODE_4M.ms.fd</loader>
    <nvram template="/usr/share/OVMF/OVMF_VARS_4M.ms.fd">/var/lib/libvirt/qemu/nvram/win11_VARS.fd</nvram>

The files OVMF_CODE_4M.ms.fd and OVMF_VARS_4M.ms.fd have the modified date of December 10, 2025. The file OVMF_CODE_4M.ms.fd is linked to OVMF_CODE_4M.secboot.fd in the folder /usr/share/OVMF/.

I looked at the OMVF UEFI configuration menu and couldn’t find anything regarding the secure boot certificates or anyway to add new ones.

My searches have led to some solutions for Red Hat, and Proxmox, but nothing specific to Ubuntu.

Here is the Windows 11 System log:

Log Name:      System
Source:        Microsoft-Windows-TPM-WMI
Date:          5/6/2026 2:37:16 PM
Event ID:      1801
Task Category: None
Level:         Error
Keywords:      
User:          SYSTEM
Computer:      Dev1-Win11
Description:
Updated Secure Boot certificates are available on this device but have not yet been applied to the firmware. 
Review the published guidance to complete the update and maintain full protection. 
This device signature information is included here.
DeviceAttributes: 
BaseBoardManufacturer:;
FirmwareManufacturer:Ubuntu distribution of EDK II;
FirmwareVersion:2024.02-2ubuntu0.8;
OEMModelNumber:Ubuntu 24.04 PC (Q35 + ICH9, 2009);OEMModelBaseBoard:;
OEMModelSystemFamily:;OEMManufacturerName:QEMU;OEMModelSKU:;OSArchitecture:amd64;
BucketId: 2a0656131aa2862c533c820200125d8c3c845a85144dde851c754bc22261465a
BucketConfidenceLevel: No Data Observed - Action Required
UpdateType: 
For more information, please see https://go.microsoft.com/fwlink/?linkid=2301018

Q: How do I make sure that the OMVF is using the secure boot certificates from 2023?

Update:

Thanks to Andrei's post in Stack Exchange I booted the VM from the Ubuntu 24.04 ISO in the Try Ubuntu mode and used the following commands:

mokutil --db > before
grep Subject: before
mokutil --kek | grep Subject:
sudo apt update
sudo apt install curl efivar
curl -LO https://github.com/microsoft/secureboot_objects/raw/refs/heads/main/PostSignedObjects/Optional/DB/amd64/DBUpdate2024.bin
sudo efivar -n d719b2cb-3d3a-4596-a3bc-dad00e67656f-db -f ./DBUpdate2024.bin -a -A 0x27
mokutil --db > after
grep Subject: after

Output

Subject: C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Production PCA 2011
Subject: C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Corporation UEFI CA 2011
Subject: C=US, O=Microsoft Corporation, CN=Windows UEFI CA 2023

On booting back to Windows, I asked for the Bitlocker recovery passphrase.

Now in Windows powershell commands I get one "True" and two "False":

([System.Text.Encoding]::ASCII.GetString((Get-SecureBootUEFI kek).bytes) -match ‘Microsoft Corporation KEK 2K CA 2023’)
False
([System.Text.Encoding]::ASCII.GetString((Get-SecureBootUEFI db).bytes) -match ‘Windows UEFI CA 2023’)
True
([System.Text.Encoding]::ASCII.GetString((Get-SecureBootUEFI db).bytes) -match ‘Microsoft option rom UEFI CA 2023’)
False

New Question

Do I need to update these remaining two certificates? If so how?

Thanks

I want to upgrade my system from kubuntu 24.04, but when I try to upgrade I get the error
Could not find the release announcement. The server may be overloaded.
Things I tried:

• change the internet connections
• change the update mirror server
• reboot the system

apt update runs normal, there does not seem to be an overload.
When running -c I get New release '25.10' available..
I could not find a verbose option for do-release-upgrade to get more info. my packages are up to date (would also be a different error message) - Is there anything I'm missing?

Anyone got working Space bar to preview files in Ubuntu 26.04? Gnome-sushi is installed but not working for me.
Do I need to configure anything for Ubuntu 26.04

After updating to 26.04, I can not switch power modes in the Quick Settings. Well, it did work ONE time, when setting to "Performance" but after that, I could not switch to "Balanced" or "Power Saver" and trying to set Power mode in Settings is the same thing.

running

sudo powerprofilesctl set balanced

works as a workaround but this does not fix the issue in Quick Settings.

This worked fine in 25.10. Is this permanently fixable?

Edit: This seems to “break” when logging in remotely. Stopping the remote session and rebooting the system fixes the issue. However, is this a bug or is this by design?

when my Lenovo x390 laptop suspends it won't wake again. Pushing the power button results in the fan turning on but the screen remains black and the power button lights slowly on and off showing that the system is in suspended mode.

Troubleshooting the issue I was booting the system from a Ubuntu 24.04 LTS live-usb. The same problem occurs.

What may be the problem, what can I do?

Best regards, Joachim

I have recently purchased Ubuntu Pro essential and want to setup Landscape to manage some hosts (around 30). I created a new Ubuntu 24.04 host and used the quickstart install for Landscape. Once complete I added my own certificates in Apache.

I can reach the webpage on https://myserver.domain.com and setup the admin user account and logged in. I went to one of my other servers and performed and installed the clients. The command I used was this:

sudo landscape-config --computer-title "$(hostname)" --account-name standalone -p mykeyforregistering --url https://myserver.domain.com/message-system --ping-url http://myserver.domain.com/ping

The machine registers and takes inventory but the last ping does not show. Then after 5 minutes it says offline as no ping was performed even though it registered.

I went to the https://myserver.domain.com/ping site with curl and from another PC with a browser and see there is a 404 page not found.

I am not sure what is missing as the install instructions do not indicate to do anything else with the "ping" setup. I can register, but the ping does not work. I have 443|80|8080 open on the local firewall for the landscape server. I rebooted and the issues persists.

I am trying to automatically allocate the remaining free space to / (root) during installation, but the LVM for / did not take the available space. Second thing swap is not configure as lvm. This is my config file-

  storage:
    layout:
      name: lvm  # ✅ Automatically sets up LVM
    config:
      - ptable: gpt
        path: /dev/nvme0n1
        wipe: superblock-recursive
        preserve: false
        grub_device: true
        type: disk
        id: disk-nvme
      - device: disk-nvme
        size: 536870912
        flag: [boot, esp]
        wipe: superblock-recursive
        preserve: false
        grub_device: false
        type: partition
        id: partition-efi
      - fstype: vfat
        volume: partition-efi
        preserve: false
        type: format
        id: format-efi
      - path: /boot/efi
        device: format-efi
        type: mount
        id: mount-efi
    # ✅ Separate /boot Partition (2GB, Not in LVM)
      - device: disk-nvme
        size: 2147483648  # 2GB Boot Partition
        wipe: superblock
        flag: ''
        preserve: false
        grub_device: false
        type: partition
        id: partition-boot
      - fstype: ext4
        volume: partition-boot
        preserve: false
        type: format
        id: format-boot
      - path: /boot
        device: format-boot
        type: mount
        id: mount-boot
    # ✅ Use all remaining space for LVM
      - device: disk-nvme
        size: -1  # ✅ Takes all remaining space
        wipe: superblock
        preserve: false
        type: partition
        id: partition-lvm
    # ✅ Create LVM Volume Group
      - volume: partition-lvm
        preserve: false
        type: lvm_volgroup
        id: vg-root
        name: vg-root
      # ✅ Create Logical Volume for Swap (8GB)
      - volgroup: vg-root
        name: lv-swap
        size: 8589934592B  # ✅ 8GB Swap
        wipe: superblock
        preserve: false
        type: lvm_partition
        id: lv-swap
    # ✅ Create Logical Volume for Root (`/`) Using Remaining LVM Space
      - volgroup: vg-root
        name: lv-root
        size: -1  # ✅ Uses all remaining LVM space
        wipe: superblock
        preserve: false
        type: lvm_partition
        id: lv-root
    # ✅ Format root partition
      - fstype: ext4
        volume: lv-root
        preserve: false
        type: format
        id: format-root
    # ✅ Mount root filesystem
      - path: /
        device: format-root
        type: mount
        id: mount-root
    # ✅ Format and mount swap inside LVM
      - fstype: swap
        volume: lv-swap
        preserve: false
        type: format
        id: format-swap
      - path: ''
        device: format-swap
        type: mount
        id: mount-swap

I tried to use a Linux virtual machine for the very first time. So I downloaded the VirtualBox and the Ubuntu 24.04 LTS. I found some tutorials how should I finish this process. Everything went well untill the intallation process, it started intalling but its never finished. Now it runs for almos 40 minutes, is it normal? I just see this:

Please somebody help me! I gave for cpu and 8gb of ram and 25 gb storage, my computer is not slow(imo)

Battery charege reduction during suspend mode (~20% in 8 hours)

OS: Ubuntu 18.04 Kernel: 5.4.0-104-generic

What I've tried:

echo deep > /sys/power/mem_sleep (as root).

Output:

cat /sys/power/mem_sleep

s2idle [deep]

I want to run a .sh executable to install software but when I try to execute the file using ./<fileName> in my terminal, following error message appears:

No suitable Java Virtual Machine could be found on your system. The version of the JVM must be 1.8. Please define INSTALL4J_JAVA_HOME to point to a suitable JVM.

1. How does one check the JVM version on the device?
2. If the JVM isn't version 1.8, how can one install JVM 1.8?
3. How does one define INSTALL4J_JAVA_HOME to point to the JVM?

I need an easy explanation because I am very new to Linux and I want to use an app that makes use of qt5 as requested by their website.

I would like to mute audio sound in certain area of movie clip. I assume that I need to add markers first and select the area I would like to mute. I couldn't find in effects any trick to do this. How can I mute certain part of audio sound from movie clip in Kdenlive?

I'm trying to use hashcat to validate a hashing algorithm but keeping this error when using authconfig command.

error: authconfig: command not found ubuntu

Am I missing something? I haven't installed ldap but the server is configured as LAMP.

As the title says how would I determine the dpi of a pdf or a djvu document?

I am looking for a proper linux solution as opposed to running adobe acrobat professional under wine.

Hey just wondering if Ubuntu had some great software designed to take notes in school?

Features: Maybe categorize by subject or course #? and Like Keywords or Section titles?

I am aware I can use LibreWord and do Headers for each section and save them to individual folders but seems like Ubuntu might have something better for school.

I am looking for PSD files viewer. Gimp is too fat for this job. I need something fast and light.