Kubuntu Forums - 25.04

[System]Solving a KDE Plasma power management / PowerDevil configuration bug…

Schwarzer Kater — Fri, 29 May 2026 23:24:41 GMT

I am currently trying to solve a KDE Plasma power management / PowerDevil configuration bug in Kubuntu 26.04 LTS.

Here it is, as an excerpt from sudo journalctl -b -p3:

Code:

[…]
org_kde_powerdevil[2931]: [ 2931] Error(s) opening ddc devices
[…]
org_kde_powerdevil[2931]: [ 2931] Error EACCES(-13): Permission denied opening /dev/i2c-4
org_kde_powerdevil[2931]: [ 2931] Error EACCES(-13): Permission denied opening /dev/i2c-5
[…]
org_kde_powerdevil[2931]: [ 2931] Error EACCES(-13): Permission denied opening /dev/i2c-8
[…]

In lack of a better idea I have tried this by adding a udev rule in /etc/udev/rules.d/ …

Why does this udev rule not work?

SUBSYSTEM=="i2c-dev", KERNEL=="i2c-[0-9]*", TAG+="uaccess"
(which I would prefer over the following one)

This udev rule works…

SUBSYSTEM=="i2c-dev", KERNEL=="i2c-[0-9]*", MODE="0660", GROUP="users"
(after I had manually added the user originally created during installation to the users group with
sudo usermod -aG users $USER
- all subsequently created users are automatically added to the users group anyway…)

Afterwards I was able to e.g. set a time for "Dim automatically:" in
-> System Settings -> Power Management (section: System) -> Display and Brightness

Any ideas why the fist rule did not work or how the permission configuration for KDE PowerDevil could be handled better?

[RESOLVED]No sound after kernel update on one computer - base-sgx/image-azure had been installed…

Schwarzer Kater — Fri, 29 May 2026 09:45:27 GMT

I have to admit that I wasn't paying attention during the update, and after the restart of my HP Elite SFF 805 G9 desktop PC I suddenly had no sound at all anymore.

I realized that Kubuntu 26.04 LTS on the HP had started with linux-image-7.0.0-1004-azure.
What the h…?!?

--> addition: this did not happen in a virtual machine or on another computer with Kubuntu 26.04 LTS. Their updates proceeded smootly and and resulted solely in linux-image-7.0.0-22-generic.

Something during today's update had led to the installation of linux-base-sgx, which then possibly must have installed the dependencies linux-image-7.0.0-1004-azure, linux-main-modules-zfs-7.0.0-1004-azure and linux-modules-7.0.0-1004-azure…- or vice versa?

I have had no time to search for the real culprit or dependencies, but
sudo purge linux-base-sgx
and a reboot solved it for now.

PS: And no, I don't have any NVIDIA graphics card and the CPU is AMD - not Intel (so no SGX here)…

--> addition
I still don't know exactly what has led to the installation of sgx/azure, but I have come up with three possible explanations:

some remnants of the developer release/beta version caused this (as the HP is the only computer/virtual machine on which I have not performed a clean installation following the official release.…)
an external repository (such as the one for VirtualBox) that is not used in any other of my Kubuntu 26.04 installations caused this
something hardware-specific of my HP desktop caused this (the most unlikely explanation IMHO).

Unless any further problems arise, I will mark this thread as "resolved"…

[Post-Install]Firefox GPU high usage and stuttering

Nik m — Thu, 28 May 2026 21:03:08 GMT

Hi, I installed a fresh installation of Kubuntu 26.04 and noticed that when I use Firefox it lags and stutters; it’s not smooth at all when I scroll. In System Monitor it also shows that GPU usage constantly goes up to 30%–50% while I’m scrolling through web pages. Has anyone had a similar problem, and how can I fix it? Thanks.

My spec: Ryzen 2600, 16gb ram and rx 5500 xt 4gb.
Monitor is Samsung 144hz. Display settings in kubuntu shows 143.98hz though, don't know why.

[Software]Issue with Dual Monitors

carlosh — Thu, 28 May 2026 17:04:57 GMT

I found an issue when using two monitors. It was observed on KDE Plasma 6.6.4 and 6.6.5. To reproduce it, simply keep both monitors connected and let the system enter sleep mode (or force it), or turn the monitors off.

After waking the system and using the display settings shortcut (next to the clock) to disable one of the monitors, the display management system fails. Both monitors lose their configuration, and the only way to restore them is by reconfiguring everything manually.

Has anyone experienced this issue or knows a solution for it? Thank you.

Black Screen After Loging into my wayland session

BarelyAlive — Thu, 28 May 2026 12:12:04 GMT

I've been using Kubuntu for some time now. But recently I've been experiencing black screens without my cursor whenever i logged into my wayland session. My X11 session still works nonetheless.

Specifications:

KDE Plasma ver: 6.3.4
KDE Frameworks ver: 6.12.0
Qt ver: 6.8.3
Kernel ver: 6.14.0-15-generic(64bit)
Graphics platform: X11

[Post-Install]Webcam still not working

pider — Thu, 28 May 2026 10:39:31 GMT

Hi!
Installed Kubuntu 26.04:

Code:

Operating System: Kubuntu 26.04 LTS
KDE Plasma Version: 6.6.4
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Kernel Version: 7.0.0-15-generic (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7435HS
Memory: 24 GiB of RAM (23.2 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 4070 Laptop GPU
Manufacturer: LENOVO
Product Name: 83JC
System Version: LOQ 15ARP9

There are a build in webcam :
Chicony Electronics Co., Ltd Integrated Camera

It din not work on 25.10 and it is still not working on 26.04, it do show up in lsusb sometimes:

Code:

sudo lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0489:e0cd Foxconn / Hon Hai MediaTek Bluetooth Adapter
Bus 001 Device 005: ID 04f2:b7ec Chicony Electronics Co., Ltd Integrated Camera
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 003 Device 002: ID 248a:8514 Maxxter Wireless Receiver
Bus 003 Device 003: ID 048d:c999 Integrated Technology Express, Inc. ITE Device(8176)
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:0002 Linux Foundation 2.0 root hub
Bus 007 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 008 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 009 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

I did post a topic in Kubuntu 25.10 Questing Quokka, but gave up while I did not manage to find a solution.
I now hope to get some more help!

[System]Stuck on "Fetching Updates

Teksonik — Wed, 27 May 2026 19:28:47 GMT

I keep getting stuck on "Fetching Updates". It's been stuck for fifteen minutes today and there is no network activity and very little CPU demand. Is this a known issue? Something I'm doing wrong? I'm not new to Linux or Kubuntu but I am by no means an expert with either. 26.04, Kernel version 7.0.0-15. Thanks for any help.

Atheros wifi adapter keeps dropping in 26.04

zpiatek — Sun, 24 May 2026 21:42:25 GMT

I'm sharing an issue I submitted at https://bugs.launchpad.net/ubuntu/+bug/2154089.

Hello, I need to report a bug in K/Ubuntu 26.04 running on a Dell Inspiron 2350.

This PC runs fine with K/Ubuntu 25.10 and previous versions, but when I try 26.04, the wifi adapter will drop after a few second, then connect again. The cycle repeats.
A popup on the screen reads:

Network Management
Wireless Interface (wlp4so)
Authorization supplicant timed out.

I tried to file an apport when I ran ubuntu-bug but the connection problem won't allow it.

The wifi adapter is a Qualcomm Atheros QCA 95565/AR9565 wireless adapter. The kernel driver is ath9k.

I tried running a few commands when I researched the problem in https://launchpad.net/ubuntu, but didn't see one posted for 26.04.

Again, this runs fine on Kubuntu 25.10 and previous. Could this be a Linux 7 issue?

Any help would be greatly appreciated, and thank you in advance!

deleting read-only USB partition

papapenguin — Sun, 24 May 2026 19:56:20 GMT

I made a backup using Kup on a USB drive (so I can update to 26.04).

Now I can't access that USB nor write a new backup to it. I can't mount it, remount it or delete it via GParted or Partition Manager.

It seems like it's never been mounted...

donald@donald:~$ sudo mkfs.ext4 /dev/sda1 #For ext4
mke2fs 1.47.0 (5-Feb-2023)
/dev/sda1 contains a ext4 file system
last mounted on /media/donald/0dbeacc9-c3d7-4d6a-912a-d5283bd3da78 on Mon Dec 1 13:30:24 2025
Proceed anyway? (y,N) y
/dev/sda1: Read-only file system while setting up superblock

donald@donald:~$ sudo fdisk -l

Device BootStart End Sectors SizeIdType
/dev/sda1 18944 484362239 484343296 231G 83 Linux

[Software]Virtual Keyboard at SDDM Login Screen

Snowhog — Sat, 23 May 2026 19:15:56 GMT

The button is present, but clicking on it does nothing. Is Virtual Keyboard only supported on a Touch Screen devices? I've Googled on this, and tried the several 'fixes', none of which resulted in bringing up a Virtual Keyboard on the SDDM Login Screen. I don't need one, but it would be nice, given the button is presented, if it actually worked.

[Post-Install]Desktop link icons clone after restart

Scorpa54 — Fri, 22 May 2026 15:52:45 GMT

After a restart my desktop icons clone themselves. They all work, there is just 2 of them. I move the articles from the desktop folder to the public folder and the clones remain on the desktop but do not function. restart with empty desktop folder and the clones disappear. move the links from the public folder back to the desktop folder and all is well until I restart. Rinse and repeat

[Software]Onboard virtual keyboard

INVICTRA — Fri, 22 May 2026 15:03:04 GMT

Latest Onboard version works OK. The problem is it can only send key-strokes to applications running under Xwayland. AI says it might be blocked from sending key-strokes to desktop or Wayland apps by the newer and stricter kwin in Plasma 6.
I mainly use it for my browser. The workaround currently is to start my browser under Xwayland.

Does anyone have a workaround?

[Post-Install]x11... a traumatic ecperience

Scorpa54 — Fri, 22 May 2026 01:33:31 GMT

I have installed the x11 desktop but when I log out and tab my way through, there is no cursor, to select that session I get my wallpaper and no cursor or navigation panels of any sort which leaves me with one option, hard reboot. I have tried multiple times with the same effect.

[SOLVED]Goes to sleep even though...

Scorpa54 — Thu, 21 May 2026 22:26:56 GMT

I've just installed (fresh) and have quite a few quirks. Let's tackle this one first. I've been into power management and turned "suspend session" to do nothing and "display and brightness" to never and when I leave for some time and come back I find a lock screen. There is another setting "other settings" that says "when inactive" and a selection of times that is defaulted to "run after 10 minutes" that I have no idea what to do with.

[Post-Install]Seeking ideas with power outage prep and protection on multiple systems. NFS and Power settings

oshunluvr — Thu, 21 May 2026 16:27:44 GMT

This will cover several different areas including power control and networking. This is about my office setup and three systems. First the story. It's a bit long so feel free to move on to another thread...

I have a desktop PC running either KDEneon (for now) or Kubuntu 26.04, a media server running Ubuntu Server 24.04, and a Raspberry Pi running Raspbian 12 (bookworm). The Pi only runs a torrent server and uses NFSv4 to retrieve and store files on the media server. The desktop also has the servers NFS shares mounted.

The desktop has a large UPS and the server and Pi share a smaller one. The server and desktop both shut themselves down after a few minutes of power loss. The Pi is not configured to do that. Also, two routers are on the same UPS as the server and Pi. The modem has its own UPS.

This week there was a power outage at 4am and power was restored at 6:30am - I slept through it. My only indication that anything had happened was I sat down at my desk and discovered my PC was off. I normally leave it running unless I know I'm going to be gone for several days. At this point I still did not know the power had failed so I just assumed I shut it down the night before and had forgotten.

Issue #1:
When I powered up the desktop and logged in, it was lagging to the point of being barely usable but nothing in "top" looked out of place.. So first I rolled back to the previous days snapshot but the results were not different. Long story short: it was two NFS mounts causing the lag because the server was off and I hadn't noticed that yet. They were mounted with "hard" as one of the options and I assume systemd was continually re-attempting the mounts.

I never turn off the server so that was my first clue that something larger had happened. Restoring power to the server "fixed" the desktop lag.

Issue #2:
Once the server was back up, using a browser on the desktop I logged into Transmission (a torrent server) that runs on the Pi and the page was all errors. So I ssh'd into the Pi and transmission was running but the NFS mounts were not available - obviously because the server had been off. So I manually remounted them and restarted Transmission and everything was running normally.

Note that the Pi was still powered up and never shut down. I assume the UPS had more than enough battery to keep the Pi up and running for the 2.5 hours power was down.

The goal:
What I would like is to create a setup where these issues do not occur when a power outage happens. I believe it would require a sequential ending of some services and shutdown times for each of the devices, and I'm not sure where to start.

I guess somehow triggering a shutdown of the Pi, then the desktop, then finally the server. This would eliminate the failing of Transmission and the NFS mounts causing problems. Re. the NFS mounts I did change "hard" to "soft" but I haven't tested to see it that helps the lagging issue.

So I guess first thing is to figure out how to trigger the Pi to shutdown. I have ssh/rsh access from my desktop PC to the Pi so I can send a poweroff to the Pi with some trigger. Then power down the desktop before the server.

All the UPSs a Cyberpower so I'll start there...

Any suggestions are welcome.