Kubuntu Forums - Current Supported Releases

[System]kubuntu 24.04 upgrade to 26.04

leotux — Sat, 12 Sep 2026 04:27:28 GMT

good night. I'm still using kubuntu 24.04. And I'm waiting for me to upgrade to 26.04 LTS. I heard somewhere that the upgrade Would be available today September 9 Does anybody know what's going on?

[Post-Install]does anyone have the discover widget in their system tray set to Always Shown?

skyfishgoo — Fri, 11 Sep 2026 21:07:20 GMT

it seems that in the latest LTS release of kubuntu, the discover icon only appears in the system tray when there are updates pending... the rest of the time it is not shown and not even listed in the configure dialog for the system tray.

does anyone have the discover icon in their system tray full time, even when updates are not pending?

here is the bug report

https://bugs.kde.org/show_bug.cgi?id=511499

Trouble with Nvidia Driver update

LuisSeyfer — Tue, 08 Sep 2026 15:10:18 GMT

Trouble with Nvidia Driver update

LuisSeyfer — Tue, 08 Sep 2026 15:10:18 GMT

Operating System: Kubuntu 26.04 LTS
KDE Plasma Version: 6.6.6
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Kernel Version: 7.0.0-2016-nvidia-bos (64-bit)
Graphics Platform: X11
Processors: 32 × AMD Ryzen 9 9950X3D 16-Core Processor
Memory: 96 GiB of RAM (93,8 GiB usable)
Graphics Processor: llvmpipe
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7E59
System Version: 2.0
Nvidia RTX 4090

I do mainly 2D/3D graphics. Because Lichtfeldstudio doesn't run under Wayland yet, I switched back to X11.
I had Nvidia 595 installed vie GUI driver manager, but wanted to update to 610 because of "Segmentation fault (core dumped)" crashes with Blender.
My first stupid mistake was that I forgot to setup Timeshift since upgrade to 26.04.
Since the Nvidia update attempt, the system is running the Nouveau driver and ignores my 2nd screen.

Code:

[I]NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.[/I]

I tried to purge with aptitude:

Code:

[I]sudo aptitude purge '~nnvidia'
sudo aptitude autoremove[/I]

I tried to install manually:

Code:

sudo aptitude install nvidia-driver-610-open nvidia-utils-610 nvidia-settings

Code:

sudo apt purge 'nvidia-*' 'libnvidia-*'
sudo apt autoremove

I tried blacklisting Nouveau and
sudo update-initramfs -u

In the meantime, I read 26.04 would use Dracut instead, but it seems not being installed.
Also, I found there are kernel modules left installed, which supposedly are kernelmodules replacing the older dkms method:

Code:

sudo aptitude search '~i nvidia'
i A linux-firmware-nvidia-graphics - Firmware for Nvidia graphics
i A linux-image-7.0.0-1016-nvidia - Signed kernel image nvidia
i A linux-image-7.0.0-2016-nvidia-bos - Signed kernel image nvidia-bos
i A linux-modules-7.0.0-1016-nvidia - Linux kernel modules for version 7.0.0
i A linux-modules-7.0.0-2016-nvidia-bos - Linux kernel modules for version 7.0.0
i A linux-objects-nvidia-595-7.0.0-1016-nvidia - Linux kernel nvidia modules for version 7.0.0-1016 (obj
i A linux-objects-nvidia-595-7.0.0-2016-nvidia-b - Linux kernel nvidia modules for version 7.0.0-2016 (obj
i A linux-signatures-nvidia-7.0.0-1016-nvidia - Linux kernel signatures for nvidia modules for version
i A linux-signatures-nvidia-7.0.0-2016-nvidia-bo - Linux kernel signatures for nvidia modules for version

Is there a way out of this mess? How?

Microsoft UEFI dbx?

Qqmike — Tue, 08 Sep 2026 14:18:33 GMT

Using K 24.04 now. In Discover updates, I see this: Microsoft UEFI dbx, 20241101 -> 20260402, and base files.
What does it mean?
That is to be ignored, right? (There is no MS Windows here.)

flatpak update fails (bottles) in discover

skyfishgoo — Sun, 06 Sep 2026 16:17:36 GMT

discover today offered an update to my flatpak of bottles, but after starting to download the file i get this error

Code:

Aborted due to failure (While pulling runtime/org.freedesktop.Platform.GL32.default/x86_64/26.08 from remote flathub: While fetching https://dl.flathub.org/repo/objects/94/6c2b5c57340e5c6b6a8e13f881976167d28161e42c45d5d6876cbeba64fb66.filez: [92] Stream error in the HTTP/2 framing layer)

.

i've tried running sudo flatpak repair and breezes thru the bottles runtime without issue, this was the output at completion.

Code:

[159/159] Verifying flathub:runtime/org.kde.Platform/x86_64/6.10…
Checking remotes...
Pruning objects
Erasing .removed

the rest of my network seems to be working fine and apt updates from the console work as expected, every thing is up to date and freshly rebooted.

is this a wait and see situation or is there something more i can try?

[Post-Install]sudo prompt

trvatrva — Fri, 04 Sep 2026 13:09:53 GMT

Can you explain to me what i did wrong. I type:

sudo -p welcome

but bash output:

expected one of these actions: --help, --version, --remove-timestamp, --validate, --list, --edit, --
login, --shell, a command as a positional argument, --reset-timestamp
usage: sudo -h | -K | -k | -V
usage: sudo [-ABbknS] [-p prompt] [-D directory] [-g group] [-u user] [-i | -s] [command [arg ...]]
usage: sudo -v [-ABknS] [-p prompt] [-g group] [-u user]
usage: sudo -l [-ABknS] [-p prompt] [-U user] [-g group] [-u user] [command [arg ...]]
usage: sudo -e [-ABknS] [-p prompt] [-D directory] [-g group] [-u user] file ...

How can I see my prompt?

[Pre-Install]Kubuntu on a HP ProBook 360 435 G8

mabra — Thu, 03 Sep 2026 17:27:58 GMT

Hi,
After a few years without Linux, I'm trying to switch away from Windows again.
After a failed attempt on a Fujitsu U9311x (no resume after suspend), I decided to ask the AI.
It recommended an HP ProBook 360 435 G8. Does anyone have this HP model up and running (without any issues)? I don’t need fingerprint recognition, but I definitely need the stylus to write.
The basics—closing the lid to suspend and opening it to resume work—should also work alongside the other features.
Before I order a leased return, I wanted to hear your opinion. Will it work, or should I steer clear?
Best regards and thanks in advance, Matthias

Translated with DeepL.com (free version)

[Post-Install]Spectacle Issue (screen blanks)

fstorm08 — Tue, 01 Sep 2026 15:08:33 GMT

Hello Everyone,

I have search this quite a bit and not quite sure when this started.

When I try to run Spectacle (or any screenshot program), my screen blanks until I hit "ESC".

Kinfo output is below:

Operating System: Kubuntu 26.04 LTS
KDE Plasma Version: 6.6.6
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Kernel Version: 7.0.0-30-generic (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 4600G with Radeon Graphics
Memory: 16 GiB of RAM (15.0 GiB usable)
Graphics Processor: AMD Radeon Graphics

My graphics are embedded on the CPU.

I have checked the "amdgpu" version and seems to be the latest driver and system is up to date with all the latest updates.

I did come across a suggestion to switch to x11 from Wayland but believe this version of Kubuntu I am on does not support x11.

I am not sure where to proceed from here.

Any suggestions would be much appreciated.

Thank you

[Post-Install]Can't enter /root directory

trvatrva — Tue, 01 Sep 2026 12:29:46 GMT

I'm trying to enter /root directory.

user@user-tobefilledbyoem:~$ sudo cd /root
[sudo: authenticate] Password:
sudo: 'cd': command not found
user@user-tobefilledbyoem:~$ sudo cd /root
sudo: 'cd': command not found

Also I am triying to enter this folder by Thunar, but system wrote:

Failed to open directory "root".
Error opening directory "/root": Permission denied.

Can you explain to me how I can get access to folder /root.

[Desktop]Minimun install fails with error

user4023 — Fri, 28 Aug 2026 18:21:45 GMT

Tried to do minimum install but the setup end with errors:

Command DEBIAN_FRONTEND=noninteractive apt-get -y --purge remove kmahjongg kmines kpat ksudoku skanlite skanpage okular libreoffice* kdeconnect krdc neochat elisa haruna vim snapd partitionmanager usb-creator* plasma-welcome kde-config-tablet plasma-welcome finished with exit code 100.
Output:
Reading package lists...
Building dependency tree...
Reading state information...
Package 'libreoffice-core-nogui' is not installed, so not removed
Package 'libreoffice-base' is not installed, so not removed
>>> error continuous >>>

Same issue was described in Topic: https://www.kubuntuforums.net/forum/...do-min-install.

But no solution provided.

I noticed this error already in the 26.04 release. Was very disappointed this was not fixed in 26.04.1.

Anybody any clue?

[Software]opening Folders problem.solved

gordo52 — Thu, 27 Aug 2026 15:41:38 GMT

I am running 26.04 LTS in dual boot with Mint Zena. I have a back up parition on another Drive. that I plan to use and swop files with each system.

Dolphin File manager will not open the folders on this partition(B-UP) I googled for answer on Google but unsure if the answers are correct and will work. Being abit of a Newbie and perhaps (thick) I found one of those answers, above me.

If anyone can assist and provide a easy to understand way of achieving the result. Always as part of my learning curve a explantion of why I cannot do this. My own thought that it do to Permissions

Appreciate any advice

[Post-Install]Cant print

Wasim — Wed, 26 Aug 2026 03:04:25 GMT

After the recent update I no longer can print despite printing happily for months. Changed drivers, tried different commands and no matter what I do I cant print. I have 2 printers (Brother Inkjet and HP inkjet), both are experiencing the same behaviour. Either the job doesn't go into the printer queue at all or it does and then prints a blank page 10 minutes later. CUPS issue? Anybody else having the same issue? Any suggestions?

[Software]Qt5 file picker causes applications to crash after upgrading to 26.04

yo5lka — Tue, 25 Aug 2026 17:12:03 GMT

Since upgrading to Kubuntu 26.04 and KDE Plasma 6.6 (currently on 6.6.6), Qt5 applications crash when they need to open the file picker for opening/saving. Qt6 applications are not affected. Below is a crash log from Qt5 Designer, but all other Qt5 applications do the same thing when opening a file picker.

https://yo5lka.net/temp/qt5_crash.log (sorry if I wasn't supposed to post links, but I couldn't figure out how to include the log without making a huge message)

Has anyone else experienced this? I found some people with the same issue over on the Arch and Manjaro forums, but most answers from there are not applicable to the Debian/Ubuntu ecosystem.

BUG in Ubuntu keyboard update!!!

steve7233 — Sun, 23 Aug 2026 20:24:17 GMT

I updated the system last night before going to bed, and today I was playing the game Banished when the entire system froze, and I had to reboot.

Code:

Aug 23 12:04:42 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:04:45 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:04:46 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:04:54 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:04:55 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:04:59 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:04:59 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:05:01 TheHartofGold CRON[4639]: pam_unix(cron:session): session
Aug 23 12:05:01 TheHartofGold CRON[4640]: (root) CMD (command -v debian-sa
Aug 23 12:05:01 TheHartofGold CRON[4639]: pam_unix(cron:session): session
Aug 23 12:05:24 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:05:25 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:05:25 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:05:25 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:05:26 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:05:26 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:05:30 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:05:30 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:05:42 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:05:43 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:05:58 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:06:01 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:06:03 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:06:03 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:06:05 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:06:05 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:06:15 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:06:15 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:06:53 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:07:13 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:07:21 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:07:38 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:07:48 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:07:48 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:07:49 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:07:49 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:10:08 TheHartofGold systemd[1]: Starting sysstat-collect.service
Aug 23 12:10:08 TheHartofGold systemd[1]: sysstat-collect.service: Deactiv
Aug 23 12:10:08 TheHartofGold systemd[1]: Finished sysstat-collect.service
Aug 23 12:12:54 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:12:55 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:12:57 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:12:57 TheHartofGold kernel: logitech-djreceiver 0003:046D:C537.0
Aug 23 12:15:01 TheHartofGold CRON[4665]: pam_unix(cron:session): session
Aug 23 12:15:01 TheHartofGold CRON[4666]: (root) CMD (command -v debian-sa
Aug 23 12:15:01 TheHartofGold CRON[4665]: pam_unix(cron:session): session
Aug 23 12:17:01 TheHartofGold CRON[4670]: pam_unix(cron:session): session
Aug 23 12:17:01 TheHartofGold CRON[4671]: (root) CMD (cd / && run-parts --
Aug 23 12:17:01 TheHartofGold CRON[4670]: pam_unix(cron:session): session
Aug 23 12:20:08 TheHartofGold systemd[1]: Starting sysstat-collect.service
Aug 23 12:20:08 TheHartofGold systemd[1]: sysstat-collect.service: Deactiv
Aug 23 12:20:08 TheHartofGold systemd[1]: Finished sysstat-collect.service

I think the Ubuntu devs have some bug hunting to do. The update was something about a 105 keyboard. That is why I suspected the update and that log seems to suggest my hunch was on target.

EDIT: I missed the first line with the command:

Code:

steve7233@TheHartofGold]$ journalctl -b -1 -e