Kubuntu Forums - Kubuntu Forums .Net

[Desktop]KDE Plasma 6.6.6 "the number of the Konqi" available in Kubuntu Backports

Schwarzer Kater — Fri, 10 Jul 2026 20:54:15 GMT

Above-mentioned updates for our preferred desktop environment are now availabe for Kubuntu 26.04 LTS in the Kubuntu Backports PPA.

Here is the link to the changelog for KDE Plasma 6.6.6: https://kde.org/announcements/change...6/6.6.5-6.6.6/

As far as I know Plasma 6.6.6 is the final release for Plasma 6.6 - also see Schedules/Plasma 6 (https://community.kde.org/Schedules/Plasma_6).

Again, thank you very much to the Kubuntu developers for providing this!

The Kubuntu Backports PPA contains "backports of new versions of KDE Platform, Plasma and Applications as well as major KDE apps for Kubuntu."

You can find the instructions how to add the Kubuntu Backports PPA directly on the website (Kubuntu Backports PPA), but here they are again:

Open the Konsole terminal emulator and enter

sudo add-apt-repository ppa:kubuntu-ppa/backports
(and confirm the addition with [Return])
sudo apt update

After this any future updates that the Kubuntu Backports PPA provide for your Kubuntu 26.04 LTS will be automatically installed when you update your system.

So now you can install the new Plasma packages e.g. by entering

sudo apt full-upgrade

and afterwards

reboot

As always I strongly recommend that you have prepared some way to revert your system to a previous state if something goes wrong, e.g.:

One can use ppa-purge (installed by default in Kubuntu 26.04 LTS) to get rid of the Kubuntu Backports' packages again.
Or use a Timeshift system backup.
Or use LVM/ext4 with snapshots or btrfs with snapshots as your file system.
Or use a Clonezilla volume backup.
Or …

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.

Anyone else notice a change lately re. application font sizes?

oshunluvr — Wed, 08 Jul 2026 13:48:56 GMT

Until recently, font scaling within applications seemed fine. For X11 apps I had "Apply scaling themselves" ticked and it seemed to work. But now, neither that or "Scaled by the system" seem to work.

Anyone else experiencing this?

I haven't started a list yet of apps that are displaying with super small fonts, but that's next.

[Post-Install]Udev prevents any attempts to sutdown that epermental WoW64 crap on very old Laptops

steve7233 — Wed, 08 Jul 2026 04:17:05 GMT

UDEV keeps failing at monitor creation, causing the winsever to completely crash! This prevents the game from even starting, which is nonsense, as the computer is designed for DirectX 10. Wow64 won't work because there is zero Vulkan support. The laptop is simply too old, so I need Wow64 to step aside and allow the machine's graphics hardware to do all the heavy lifting. I think UDEVs problem is it is way to agressive at querying the USB system for mobo status. I have all three USB ports with wireless USB dongles, all Logitech. One dongle is for a wireless headphone/mic. The other two are for my wireless keyboard and wireless mouse. HP Pavilion 1030 dv6-us. It uses an Intel Core2 Duo and an Intel GMA 4500 HD for integrated graphics. Also, OpenGL 2.1. The Game is Banished, which played just fine on this laptop/gaming PC back in 2014 using the then-current Xubuntu. I was distro hopping to find something that worked until me and the Google AI figured out that the window manager wasn't the issue; it's getting mordern wine/Proton to let the hardware run the graphics engine instead of using DKVK. So I decided to switch back to Kubuntu to get KDE/Plasma again, only to discover that Microslop syndrome was taking over the Ubuntu developers' minds! I thought Ubuntu was supposed to be designed to allow users to do what they want with their own machines as long as its leagal.

Dual booting *ubuntus, multi-disk, 1 or more ESPs

Qqmike — Tue, 07 Jul 2026 21:37:15 GMT

-- advertisement -- ;-)

My how-to ain't half bad:

Dual booting two (or more) *ubuntu operating systems in UEFI mode -- 1 drive or 2 drives, 1 ESP or 2 ESPs
https://www.kubuntuforums.net/forum/...-esp-or-2-esps

It addresses topics I see people asking about around here regarding UEFI and ESPs.
It is written in a tutorial mode, which should help anyone doing this stuff for the first or second time or for review.
I just read through it myself and caught a couple typos I corrected.
Of course, it can't be purely tutorial, it would be three to five times as long (it's already 19 pages, 8.5x11" 1/2-inch margins, single space 12 pt type).
But it's pretty clear for DIY.

Note: It does not deal with Windows. It deals only with Ubuntu-based OSs (but I think you can usually, easily extend it to other Linux OSs).
You can certainly use the principles to help you set up dual booting with Windows OSs. There's plenty of sources for help on this.
My how-to should equip you with the know-how when it comes to dealing with your UEFI booting.

Table of Contents

SECTION 1 Dual booting two OSs on the SSD with one ESP
SECTION 2 Using two ESPs on one disk drive
SECTION 3 Labels and NVRAM boot variables
-- Changing labels of NVRAM boot variables in the efibootmgr list
-- Creating NVRAM boot variables (to appear in UEFI-BIOS boot menus)
-- sudo efibootmgr -c -d /dev/sdx -p n -L NewLabel -l \\EFI\\\\
SECTION 4 Creating separate NVRAM variables for two *ubuntu OSs
SECTION 5 Installing an SSD M.2 as a second drive -- using the disk name nvme_n_p_
SECTION 6 Install Kubuntu 24.04 to the M.2 as a third OS (so, 2 drives, 3 OSs, 1 ESP)
SECTION 7 Three OSs on two drives using an ESP on each drive
SECTION 8 Concluding comment, and surviving updates

APPENDIX -- Table of Contents
1 -- Summary of key commands and some facts
2 -- ESP -- how big?
3 -- Partitioning with GParted
4 -- Getting the new Kubuntu 24.04
5 -- Making the live USB Kubuntu installer
6 -- Experimenting -- accessing the ESP
7 -- rEFInd
8 -- Make a rEFInd flash drive
9 -- How to re-enable os-prober so you can use the GRUB command update-grub
10 -- The /boot/efi/EFI/ubuntu directory: An IMPORTANT fact about it
11 -- Installing OSs to a system with two or more ESPs -- Calamares installer and another trick.
12 -- How to boot into an operating system if it is no longer set as 'first in boot order'

This how-to contains a listing of all my UEFI how-to's:
UEFI, GPT, ESP, GRUB2-EFI, dual-booting, fixing things
https://www.kubuntuforums.net/forum/...-fixing-things

A decent, quick read, for those who sort of know the basics is:
UEFI Simplified, a quicker version
https://www.kubuntuforums.net/showth...l=1#post379977

[Network]Netplan vs Network Manager for static IP

TwoFistedJustice — Tue, 07 Jul 2026 00:01:01 GMT

In 24.04 when I entered the command `nmcli connection show` I was shown a list of UUIDs drawn from the files stored at `/etc/NetworkManager/system-connections/someUUID.nmconnection`

Now in 26.04 those files are gone, but the command still shows me the same old list.

Some digging found .yaml files with the info I needed at `/etc/netplan/90-NM-someUUID.yaml`

If I want to set IP addresses and such do I still use `nmcli connection modify [args]`?

Or has that been replaced, and if so what is/are the command(s) I need to learn to use?

[Soapbox]The Forum for Kubuntu 25.10 will Close July 9, 2026

Snowhog — Mon, 06 Jul 2026 18:21:16 GMT

Kubuntu 25.10 reaches EOL (End of Life) on July 9, 2026. The forum will be Closed to further posting on that date.

[SOLVED]Upgrade tries to remove essential apps like Konsole and Dolphin

GGKazz — Mon, 06 Jul 2026 12:59:09 GMT

Hello all,
I'm trying to upgrade from Kubuntu 25.10 to 26.04 LTS however the upgrade removes all kinds of essential apps like Konsole or Dolphin.

Code:

Remove (was auto installed) apport-core-dump-handler dolphin
  dolphin-plugins elisa gwenview haruna kate kde-spectacle kdeconnect
  konsole konsole-kpart libasound2-plugins
  libgstreamer-plugins-good1.0-0 libgusb2 libgvc6 libk3b-extracodecs
  libkf6texteditor-katepart libonnxruntime1.21 libplasma6
  libplasmaquick6 libqt6multimediawidgets6 libreoffice-kf6
  libreoffice-qt6 mesa-va-drivers mesa-va-drivers:i386
  mesa-vdpau-drivers mesa-vdpau-drivers:i386 neochat okular
  packagekit-tools phonon4qt5-backend-vlc phonon4qt5settings
  plasma-widgets-addons python3-fuse python3-sip
  qml6-module-org-kde-kirigamiaddons-labs-components
  qml6-module-qttexttospeech qt6-speech-speechd-plugin
  sddm-theme-breeze xwaylandvideobridge

A few weeks ago I did the upgrade and did not pay enough attention so after the upgrade I couldn't access my files or open de terminal. I figured I'd try again later so I reverted back using Timeshift. But now I have to upgrade in a few days so I'd like to be able to resolve the issue.

My system information:

OS: Kubuntu 25.10 (Questing Quokka) x86_64
Host: B850M GAMING X WIFI6E (Default string-CF-WCP-ADO)
Kernel: Linux 6.17.0-40-generic
Uptime: 1 hour
Packages: 2610 (dpkg), 6 (flatpak), 14 (snap)
Shell: bash 5.2.37
Display (Q27P1B): 2560x1440 @ 60 Hz in 27" [External]
Display (LG ULTRAGEAR): 2560x1440 @ 180 Hz in 27" [External, HDR] *
DE: KDE Plasma 6.4.5
WM: KWin (Wayland)
WM Theme: Breeze
Theme: Breeze (Light) [Qt], Breeze [GTK2/3]
Icons: Papirus-Dark [Qt], Papirus-Dark [GTK2/3/4]
Font: Noto Sans (10pt) [Qt], Noto Sans (10pt) [GTK2/3/4]
Cursor: breeze (24px)
Terminal: konsole 25.8.1
CPU: AMD Ryzen 7 9800X3D (16) @ 5.27 GHz
GPU: AMD Radeon RX 9070 XT [Discrete]
Memory: 3.79 GiB / 30.96 GiB (12%)
Swap: 0 B / 512.00 MiB (0%)
Disk (/): 561.59 GiB / 1.79 TiB (31%) - ext4

Let me know if you need any more information. Thank you.

30 s boot stall "Scanning for Btrfs filesystems"

jlittle — Mon, 06 Jul 2026 00:57:35 GMT

The NVMe SSD in my desktop died a few days ago, while it was in use (as the sender of a send/receive incremental backup). It was only a few years old. It is completely lifeless.

Using an old (2015) SATA SSD, I restored from a backup, and with some adjustments to /etc/fstab and a few subvolume creations (for .cache and snapper snapshots) Kubuntu 26.04 is running, albeit more slowly.

But during the boot, before plasma starts there is a step that stalls for about 30 s:

Code:

Scanning for Btrfs filesystems
registered /dev/sdc1
registered /dev/sdb6
registered /dev/sda2

(Those devices are those with btrfs on them, the last being the drive being booted.)

Can anyone explain this step? Removing the failed drive had no effect. Another install, a vanilla Kubuntu 26.04, on the same SSD does not have the problem.

WiFi issue

KaizenQuest — Mon, 06 Jul 2026 00:19:48 GMT

Post moved by Administrator Snowhog with reference to thread added.

Ref: https://www.kubuntuforums.net/forum/...oot#post693103

Hi all,
I have read through the excellent and helpful feedback in this thread, but I have a slight variation on the problem that I would like to raise if I may.

I am running Kubuntu 26.04 on an HP 250 G4 laptop, 16GB RAM with a 500GB SSD (LUKS encrypted). Once I performed the upgrade to this version of Kubuntu, this has been happening.

The computer starts up fine.
Login works without any issues (both LUKS and user logins).
Once logged in, the problem starts. The system keeps on connecting and then disconnecting the wifi card. As a result, there is no internet connectivity. I am currently connected by using my cellphone via USB tethhering.

I have researched and found that one option is to upgrade the BIOS to bring it alignment with the stricter hardware requirements of this version of Kubuntu. I have prepared a Windows PE memory stick to boot into, so that I can run the BIOS update from there, as this is simpler than running it via Linux.

I then ran into a second problem. The computer is also not detecting bootable USB devices. at startup when I startup using the F9 key.

I would be most grateful for advice with regard to overcoming these two challenges.

Thanks in advance.

[Post-Install]Headset USB-Dongle is not recognized after boot

Wobbelblob — Sun, 05 Jul 2026 06:51:00 GMT

So, a curious problem that has followed me over more than one OS. My Corsair Virtuoso XT headset has a wireless USB Dongle. But for some time now, the headset (or the dongle) doesn't activate directly after a boot. I need to reinsert it after the boot. That always fixes the problem. I first thought that was an issue with my Bazzite which has produced more than one curious issue by now. But after (fully) switching to Kubuntu yesterday, the problem persists, which is weird. Any ideas how to fix it?

What I do know is that the headset doesn't even show with

Code:

lsusb

at all. This is the result I get before reinserting it:

Code:

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 002: ID 2516:0047 Cooler Master Co., Ltd. MasterKeys Pro L
Bus 007 Device 003: ID 067b:2586 Prolific Technology, Inc. USB 2.0 Hub            
Bus 007 Device 004: ID 2357:0604 TP-Link TP-Link UB500 Adapter
Bus 007 Device 005: ID 3837:1012 wch.cn MCHOSE MagDock
Bus 007 Device 006: ID 3837:100b RealTek MCHOSE A7 V2 Ultra+
Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

and directly after I get it to activate:

Code:

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 006: ID 1b1c:0a64 Corsair CORSAIR VIRTUOSO XT Wireless Gaming Receiver
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 002: ID 2516:0047 Cooler Master Co., Ltd. MasterKeys Pro L
Bus 007 Device 003: ID 067b:2586 Prolific Technology, Inc. USB 2.0 Hub            
Bus 007 Device 004: ID 2357:0604 TP-Link TP-Link UB500 Adapter
Bus 007 Device 005: ID 3837:1012 wch.cn MCHOSE MagDock
Bus 007 Device 006: ID 3837:100b RealTek MCHOSE A7 V2 Ultra+
Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

LTS, security, maintenence and some new guys questions

Kabelbaum — Sun, 05 Jul 2026 04:46:10 GMT

Hello Kubuntu members!
I am quite new to this and installed Kubuntu some weeks ago. I also followed most of the Tips from here. So I am curious about some things I wanted to ask here because I read different things about this.

General *buntu questions:

Are there things in terms of staying safe to do in general? Besides using the firewall and keeping everything as up-to-date as possible? I read a lot of negative feedback about Snap but snap has a strong sandbox and it is controlled by Canonical so Browser/Mail should be very safe as a Snap. Why do people want to remove Snap in general? Is there a different reason? Should you just not use it or not install further Snaps?

In general my concept would be to install my GUI apps as a Flatpak/Snap and only if necessary as a deb to keep the system neat and benefit from newer software than on the *buntu servers. Good idea or is it better the opposite way?

More KDE related:

I am on 26.04 now and it is the LTS. It will get at least 2-3 years of Updates for security (no feature updates for KDE or other software). Is it in general safe to use it for the time until the EOL or is KDE a problem here because vulnerabilities do not get patched (because it is frozen)?

The usability of Kubuntu (KDE) is very good in my opinion and even for somebody with not so much knowledge it is easy to use for basic stuff.

I would like to use my gdrive to mount it in Dolphin. Is rclone the only way to do it? And is it safe to do so and put it on automount when the system starts? It feels kind of weird or insecure for me. Is there maybe another way to use gdrive or would you recommend a different cloud service which is better integrated in KDE and if so which one?

Whenever I try to download widgets or themes directly through the built-in system settings store, it feels very unstable and frequently runs into errors or fails to load. Is the store generally known for having problems, or is this just an issue on my end?
As a workaround, is it completely safe to download the files manually from store.kde.org and move them into the corresponding folders myself, or can this cause security issues?

Thanks for reading and have a good day!

[SOLVED]After a system update within 26.04 Steam refuses to run even after commands for namespace

MichaelEber — Sun, 05 Jul 2026 02:52:06 GMT

As soon as it was available i installed Kubuntu 26.04. I have had everything working without any issues, including running Steam. A day or two ago I had an update that I ran and at the end of the update it stated I had to restart in order to complete the install. I must assume that meant some operating system files had to be dealt with in that update and I restarted my system. After that, the next day I noticed I didn't have Steam running so I started it and got an error:

Steam now reqwuires user namespaces to be enabled.

This requirement is the same as for Flatpak, which has more detailed information available:
https://github.com/flatpak/flatpak/w...e-requirements.

First I tried to make send of that and got lost. So I googled how to do this and followed the directions.

FIRST:
echo 'kernel.unprivileged_userns_clone=1' | sudo tee /etc/sysctl.d/10-user-namespaces.conf sudo sysctl -p /etc/sysctl.d/10-user-namespaces.conf

after which I did this:
If you are on Ubuntu 24.04, you may also need to disable AppArmor restrictions by creating /etc/sysctl.d/60-apparmor-namespace.conf with the content kernel.apparmor_restrict_unprivileged_userns=0, then applying it via sudo sysctl -p /etc/sysctl.d/60-apparmor-namespace.conf.

Then I finally tried the last step:
sudo setcap -r $(which bwrap) It stated that ther is no remove command
sudo chmod u+s $(which bwrap) Seemed to run without a problm

After all of this I went to launch Steam and it flushed itself down the toilet once again!!! HELP

[Post-Install]Keyboard Backlighting

Steve The Noob — Sat, 04 Jul 2026 22:48:38 GMT

I have recently installed Kubuntu 26.04 LTS on a new Lenovo Thinkbook 16 Gen 8 laptop. Everything was going great ... until early yesterday morning.

After some early AM random surfing, I shutdown the laptop (I did not put it in 'sleep' mode).

However, then the back-lighting for every key on the keyboard lit up !! The laptop did shutdown, but the back-lighting remained on. I attempted to log back in, aiming to shut the system down again but could not do so. Pressing the power button did nothing; holding the power button down for an extended period did nothing - the system would not re-boot. I went back to bed, figuring that everything would sort itself out by morning.

However, the status was exactly the same when I awoke later that morning (5am). All back-lighting was still on. I should note that I normally keep the power plugged-in when at home. I decided to unplug the power supply and let the battery run-down to zero, hoping this would solve the issue. Fortunately it did. When the battery had reached zero, I plugged the power in again and was then able to turn the laptop on.

I used AI (Claude) to research the problem. Aided by the AI, I checked the relevant page for my device on the Lenovo support website, as well as the boot logs for my device. The AI was able to determine that the event was related to a somewhat uncommon EC issue.

I am not entirely certain if this was a 'Kubuntu' problem or a 'Lenovo' problem. The problem has not re-occurred, even after multiple re-boots. Additionally, I had been running Kubuntu for several days before the issue.

I would appreciate if someone who knows Kubuntu more than I (ie: most of you !!) could shed some light on this issue.

display shows very large courser pointer and large fonts after log in in kde user edition plasma 6.7.0

marco07 — Thu, 02 Jul 2026 23:34:26 GMT

Folks the title says it all. this is what I got today after login in my fully updated kde
neon the mouse movent is so fast and the fonts are so large that i can not get out of this. I switched from waylan to x11 which did not help. any comment as how to solve this? thanks!