Kubuntu Forums - Current Supported Releases

[SOLVED]Updates seem to work but login screen and desktop very low resolution

barfly — Fri, 24 Jul 2026 10:14:29 GMT

I have tried a few times to update my Noble install, but every time it fails with the same result, 1024x768 resolution on both the login and desktop screens. The connection is from an HDMI cable from my computer in the loft to my Samsung 55" S95B in my lounge. The install is fine, login and desktops run at 1920x800 or 3840x2160 depending on scaling.

The GPU is an older GTX1600 Nvidia.

I have tried inserting

Code:

xrandr --output HDMI-1 --mode 1920x1080 --rate 59.94

Into /usr/share/sddm/scripts/xsetup

I have tried nvidia drivers 470, 580 and 595 and nouveau drivers all the same result.

But that does nothing.

My 26.04 install and Windows 11 work fine, and reverting back to an older backup of 24.04 works every time.

Updates kill my resolution, 50% of stuff is off-screen with no way to change the resolution.

Any ideas? I am fresh out of them.

Cheers Tony

Gaming on Linux help

steve7233 — Fri, 24 Jul 2026 05:05:37 GMT

Which is the best AI to help get games to work on Linux? Google AI seems not to be so good.

My wife's desktop displays bigger than the screen

MichaelEber — Thu, 23 Jul 2026 01:46:08 GMT

My wife has a Lenovo IdeaPad slim 3 15
Monitor is 15.3 and default resolution is 1920x1080 (16:9)

Display is set in Display at 1920x1080 but the desktop must be moved to see all parts of the Desktop

I searched for fixes and one I couldn't find which was the DPI of the font, but I doubt my wife would change anything.
After all she used it this way for a long time without saying anything.

Operating System: Kubuntu 25.10
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-41-generic (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i3-N305
Memory: 8 GiB of RAM (7,5 GiB usable)
Graphics Processor: Intel® Graphics
Manufacturer: LENOVO
Product Name: 82XB
System Version: IdeaPad Slim 3 15IAN8

404 not found

skyfishgoo — Wed, 22 Jul 2026 16:50:01 GMT

anyone else having issues with the update server this morning, or is it just me.

tried several different servers and none of them will complete

Code:

Package download failed:

E: http://security.ubuntu.com/ubuntu noble-security/main amd64 libgphoto2-port12t64 amd64 2.5.31-2.1ubuntu1.1 is not (yet) available (404  Not Found [IP: 91.189.92.22 80])
E: http://security.ubuntu.com/ubuntu noble-security/main amd64 libgphoto2-6t64 amd64 2.5.31-2.1ubuntu1.1 is not (yet) available (404  Not Found [IP: 91.189.92.22 80])
E: http://security.ubuntu.com/ubuntu noble-security/main amd64 libhtml-parser-perl amd64 3.81-1ubuntu0.1 is not (yet) available (404  Not Found [IP: 91.189.92.22 80])
E: http://security.ubuntu.com/ubuntu noble-security/main amd64 libgphoto2-l10n all 2.5.31-2.1ubuntu1.1 is not (yet) available (404  Not Found [IP: 91.189.92.22 80])

tried a different server

Code:

Package download failed:

E: http://security.ubuntu.com/ubuntu noble-security/main amd64 libgphoto2-port12t64 amd64 2.5.31-2.1ubuntu1.1 is not (yet) available (404  Not Found [IP: 91.189.92.22 80])
E: http://security.ubuntu.com/ubuntu noble-security/main amd64 libgphoto2-6t64 amd64 2.5.31-2.1ubuntu1.1 is not (yet) available (404  Not Found [IP: 91.189.92.22 80])
E: http://security.ubuntu.com/ubuntu noble-security/main amd64 libhtml-parser-perl amd64 3.81-1ubuntu0.1 is not (yet) available (404  Not Found [IP: 91.189.92.22 80])
E: http://security.ubuntu.com/ubuntu noble-security/main amd64 libgphoto2-l10n all 2.5.31-2.1ubuntu1.1 is not (yet) available (404  Not Found [IP: 91.189.92.22 80])

same error

this is from using discover

[SOLVED]Unable to mount USB sticks

GerardV — Wed, 22 Jul 2026 09:22:48 GMT

All of a sudden i have been unable to mount any USB stick. The system, 26.04, will see them but when i try to mount any of them i get this error:

gerard@gerard-kubuntu2:~$ udisksctl mount -b /dev/sdc1
Error mounting /dev/sdc1: GDBus.Error:org.freedesktop.UDisks2.Error.Failed: Error mounting system-managed device /dev/sdc1: wrong fs type, bad option, bad superblock on /dev/sdc1, missing codepage or helper program, or other error

I get the same error message when trying to mount it in Dolphin
They all mount just fine in CashyOs and Deepin also installed on the pc so that rules out a hardware error
Has anyone seen this before?

Icons/visual display enlarged after update: Follow up

akoontz11 — Mon, 20 Jul 2026 16:31:21 GMT

This post is a follow up from a previous post describing the issue (i.e. after updating my server from Jammy Jellyfish to Noble Numbat (Ubuntu 24.04.1 LTS), the visual display is extremely enlarged). I realize the original post is old, but I'm now at the system being described and trying to fix it.

Below I've listed the things I've tried to address the problem.

System settings: per a recommendation from AskUbuntu, I've gone into KDE System settings and checked the "Force Font DPI 96" checkbox (no change).
kscreen
1. kscreen-doctor -o
  Output: 63 None-1 enabled connected priority 1 Unknown Modes:
  65:640x480@60*! Geometry: 0,0 640x480 Scale: 1 Rotation: 1 O
  verscan: 0 Vrr: incapable RgbRange: unknown
2. Attempting fractional scaling: kscreen-doctor output.None-1.scale.2
  kscreen.doctor: setop exec returned KScreen::Config(
  KScreen::Output(63, "None-1", connected enabled priority 1, p
  os: QPoint(0,0), res: QSize(640, 480), modeId: "65", scale: 2
  , clone: no, rotation: KScreen::Output::None, followPreferred
  Mode: false) )
kwriteconfig
1. Calling kwriteconfig5 --file ~/.config/kcmfonts --group "General" --key "forceFontDPI" "96" did nothing (and calling the same command using kwriteconfig resulted in the message "Command not found").
2. Finally, manually creating the ~/.config/kcmfonts file and including the recommended text did nothing.

I appreciate this is a strange issue, but if anyone has any further suggestions, I'd really appreciate it. My only other solution is to scrap Kubuntu entirely.

Thanks very much for any tips.

[SOLVED]An observation re. Psensor

Teunis — Mon, 13 Jul 2026 21:05:46 GMT

Hi,

Since several months or maybe even a year my laptop would suddenly loose the KDE panel and the only way to recover the system would be a hard shut down.
This would happen more and more often.

Now I found a solution, normally I'd have Psensor running but once it is off the computer regains its normal Linux stability.
To be sure and because I hardly ever looked at it anyway I uninstalled it.

checking to see if wayland is installed

666JTK666 — Wed, 08 Jul 2026 23:02:19 GMT

my system is running PLASMA X11 and i want to switch to wayland, but i dont seem to have that option. rebooting the xomputer to the login screen there is no little gear icon to switch between x11 and wayland.
So i would like to check and see if wayland is installed and if not get it installed.
As a side quetion how do i upgrade to 26.04 wayland is the default on the newest release.
X11 has been working fine but there is a piece of linux software that will only run on wayland that i would like to use.

thank you in advance for your help and suggestions.