r/Kubuntu

[This post should have an "annoyed guy rant" tag]

As daily driving ubuntu since 6.06 I truly was frustrated twice. When Ubuntu switched from Gnome 2.x to 3.x - that was the moment when I jumped off the train and switched to KDE - and with latest release of Kubuntu 26.04 - with inconsistent DE configurations.

Maybe I'm too spoiled with how smooth linux experience is now and I forgot how hardcore it was back in days with bunch of random scripts, weird PPA and hours spent with random people on IRC to make things work.

But recent LTS feel more like X.10
With recent release - 26.04 - I think the most annoying is that DE settings are randomly switching to "defaults" after few restarts

Examples:
- wobbly windows - turning on randomly
- autostart - removing randomly programs from the list
- devices auto-mount - not mounting drives in random pattern
- cursor settings and feedback - changing size and animation
- system monitor layout - crashing overview tab that need to be reloaded from saved file
- windows tiling - wiping tiling layout to a single window + default padding

Thats only from DE side as everyday I find more but I can fix them on my own.

Do anyone track Kubuntu mailing/issues list and know what of these things could be fixed or will be fixed in "bulk" patch?

https://preview.redd.it/ta8mrt665g2h1.png?width=1920&format=png&auto=webp&s=be6adf8e737e63f4deaf29c6fbbccbbcafb0f864

I have tried. lots of distros, in my opinion, like Kubuntu, Fedora KDE, and Caschy OS, are the best.

I've been chasing the "perfect" lean setup for quite awhile. Minimal setup here, minimal setup there... Arch, Arch-based, back to plain Arch all to avoid snap packages. I've tried minimal installs of Kubuntu, but always felt they'd sneak into my build one way or another. Debian was a good run, too. But always felt too outdated in certain areas.So tonight, I caved and threw in the towel. I installed Kubuntu (again for the againth time) but didn't bother with avoiding Canonical's snaps. Here's what I've learned: not only are they not intrusive, but they are so damn easy to manage and contain. Discover even keeps different package types organized. Flatpaks, Snaps, Native packages are all have their own tabs so to keep up with what is what. With that said, avoiding snaps is actually way more trouble than it's worth. I hope this helps others who might be in a similar situation as I have been.

Hi, yesterday I updated to Kubuntu 26.04. When launching Elder Scrolls Online on Steam, I noticed that everything started running slowly, and the cursor was lagging. What I also encountered was the cursor getting bigger at some times.

I tried using a different Kernel, found some tips to use 7.0.6 from Mainline, but it didn’t help. Switching from Wayland to X11 solved the issue, but I have some issues with X11 like a black screen on Steam, so I’d prefer to stay on Wayland.

Any tips? This is my first distro and everything is new to me.

It says in the kubuntu notes that if you get theme issues after upgrading to 26.04, first reset the theme and then if it is still an issue to nuke ~/.config

Is that the real solution or should I only remove the kde stuff in ~/.config, though there is a lot of kde in there?

Luckily, nothing important was lost but Kubuntu has been completely blacklisted as a viable Linux distributions for me.

After such a catastrophic bug, that apparently many other users have experienced?

I am sorry but I am never recommending Kubuntu to anyone again, I will discourage others from even trying it out.

That is ignoring the fact the installation failed initially.

Since Kubuntu is a community run Linux distribution, I don't expect as much when compared to the standalone Ubuntu one, but I at least expect the basics.

Hey everyone. I'm just going to talk about my experience with the LTS update, hopefully it can help others.

I was using the 24.04 LTS and I was very excited about the new release. I stayed up until it was available and I forced the update, followed all the official recommendations and I've let the installation do its magic. First of all, the upgrade took way too much time and I definitely had to run a fix for broken packages afterwards, then I've met some inconsistencies, especially when I tweaked my resolution, font and cursor size, the lock screen stayed the same and I didn't fix it further, sometimes the configurations didn't registrate and I had to apply them again. Also, some softwares were broken especially the graphic interface, like libreoffice, which I had to do alot of acrobatic moves to fix it.

But later, I took the decision to make a fresh install, I did it a few days ago and it's really a huge difference, maybe because lots of issues were fixed since the launch, but it was a better experience, I didn't had to troubleshoot much at all, only to install a few old drivers or compatibility drivers since it's wayland only and many softwares still need X11. But overall I didn't had any troubles and everything work as intended, smoother and faster. I also added some things like support for AppImages and zram, I'm certain I will tweak it more since I can.

So my recommendation for anyone who had met issues with the upgrade, to backup all important data (personal and work) and do a clean install and start over. (I did also format my ssd, with swapfile but the ram wasn't enough for me since I have an 8Go ram on my laptop, installed zram and gave the swapfile up to 4Go)

I recently moved to using Kubuntu 26.04 after being on windows for quite a few years - it’s been fine but there’s something wrong with using the mouse on external monitor that is capped at 60hz as compared to my laptop screen which has a refresh rate of 240hz.

The cursor movement on my monitor feels laggy and not so smooth. On the laptop screen, the cursor is laggy when set to 60hz but when i change it to 120hz or 240hz the cursor feels smooth. The same behaviour is observed with the touchpad.

What I’ve done so far (with the help of an AI):

1. Mouse polling rate confirmed active at ~1000Hz via libinput debug-events
2. usbhid.mousepoll=1 kernel parameter applied and confirmed via /sys/module/usbhid/parameters/mousepoll
3. Acceleration profile set to flat (PointerAccelerationProfile=1 in ~/.config/kcminputrc)
4. Hardware cursor confirmed active — no software cursor fallback in journalctl
5. KWin LatencyPolicy=Low set in ~/.config/kwinrc — no noticeable difference
6. Cursor feels perfectly smooth on the laptop’s built-in 240Hz display, noticeably less smooth on 60Hz external monitors

Research suggests GNOME/Mutter handles hardware cursor plane initialisation more reliably than KWin on Wayland, resulting in better perceived cursor smoothness at 60Hz. Is this a known KWin limitation, and are there any KWin-specific settings or workarounds to improve cursor plane handling on external monitors connected via Thunderbolt dock?

​Hardware info:

• 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: 24 × Intel® Core™ Ultra 9 275HX
• Memory: 96 GiB of RAM (93.7 GiB usable)
• Graphics Processor 1: Intel® Graphics
• Graphics Processor 2: NVIDIA GeForce RTX 5060 Laptop GPU
• Docking station: Dell Thunderbolt 5 SD25TB5
• Monitor: Lenovo L32p-30 (60hz max)​

I’ll appreciate any suggestions. Thanks.

Hey all, I switched to kubuntu KDE 26 today, and I downloaded some programs I use a lot, and that were only available as appimage file.

After making them executable, I keep getting an error about chrome sandboxing, which according to the internet can be fixed "permanently" with sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0.

The issue is that while that does work, it stops working after a reboot, and I'll have to enter that command again to be able to open my programs.

The programs are currently sitting on my sekstop.

Is there a better way to do this? The programs I use are the Arduino IDE v2, and NRFConnect, and as far as I can tell neither are available in a different filetype.

Thanks!

EDIT: Here is the exact error I'm getting:

[6757:0518/230504.736786:FATAL:setuid_sandbox_host.cc(163)] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /tmp/.mount_nrfconC6IqRK/chrome-sandbox is owned by root and has mode 4755.

This is my first time upgrading Kubuntu and i don't know whats going wrong? I tried checking the Kubuntu website and the 26.04 upgrade link just says "coming soon".

I'm assuming its just bugged, Is there a way to upgrade through terminal or something else? I have backed up my .config and .local but i don't know if that's relevant 😣

Operating System: Kubuntu 25.10
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-23-generic (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 9800X3D 8-Core Processor
Memory: 32 GiB of RAM (31.0 GiB usable)
Graphics Processor: AMD Radeon RX 9070 XT
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: B850M AORUS ELITE WIFI6E ICE
System Version: Default string-CF-WCP-ADO

First off, let me make sure this is a new plasma feature, as I am not sure it was available back in 24.04. So it seems that I can copy / move files directly without Dolphin prompting me to choose what to do, based on detecting source and destination devices.. just like windows and macs.. yaaaay. However, occasionally, Dolphin will move files between two different drives, and I don't know when, but I assume mounting drives in the /run folder might have something to do with it.

Has anyone noticed anything like this?

https://preview.redd.it/9rfxzwx7nw1h1.png?width=587&format=png&auto=webp&s=590da49bf9a227817fca9588c14346d0cf17862e

https://launchpad.net/~kubuntu-ppa

backports and updates both have 6.6.5, the first new point release after 26.04 launch.

26.04 is "Resolute"

The updates PPA is described as being an early release of updates destined for official 26.04 updates (point releases). The backports PPA typically includes new KDE releases which won't be officially supported.

Updated my machine to 26.04 LTS this morning, and now my mousecursor is stuttering, seems like its running at 20fps or so.

This was not a noticeable issue before the update, running 25.

I can't seem to find anything in the settings to mitigate this, does anyone know of a fix for this?

what are the good and bad things about Kubuntu to know before switching? i've heard mixed opinions

I installed and updated Kubuntu 26.04 on my Dell Latitude 5520.

The problem is that the screen resolution maxes at 1366x768, where Windows was at 1920x1080.

The graphic card is integrated Intel Tigerlake-LG GT2 (Iris Xe Graphic)

Is there a way to fix this?

I'm running 25.10. I have started getting notices from KDED that 26.04 is available and I'll stop getting updates (including security fixes) in 53 days, which works out to July 9, 2026. It looks like 26.04.1 is scheduled to be released on August 4. This means there's a gap of about a month between the date 25.10 is no longer supported and the date I can upgrade to 26.04.1.

I can upgrade to 26.04 now, but I'd prefer to upgrade to 26.04.1 since dot releases clean up a lot of the .0 release issues. Is it safe to upgrade to 26.04, or should I wait until 26.04.1, knowing that I won't be getting security fixes for a month?

Just wanted to share, that the Kubuntu prompted me on 25.10 to update 26.04.

After waiting a few weeks, I decided to do it (because of the prompt), and not to wait for the .1 release.

And everything was fine.. I mean, super fine, everything went smooth, and the bugs I had (not everything, but the main, freezish bugs) went away. There were a lot of plasma freezes where I needed to use x11 for the apps, but for now, I don't see any real issue, which need a x11 config for me, so the KDE update is a real win for me.

I wanted to wait because of nvidia, but I had 580, just upgraded to 595, and as I could see, it's a real jump, with a lot of bug fixes (not the driver itself, I tried to fix the sleep issue with the driver update).

My config:

- Intel Core Ultra 7 265K (w/ 64GB DDR5)

- Nvidia 3060 12GB with 4 displays working (2x2160p[DP], 2x1080p[HDMI] with various refresh rates and placements) and an iGPU with a.. well, don't laugh, but an old MacBook Pro 17" display with a screen controller HDMI->VGA for the iGPU.

So 5 displays working really well, and had no issues overall.

Actually: there is one issue for now: The sleep does not work. This may be an nvidia issue, but I couldn't find anything on how to fix this, so for now I don't have a sleep function, if the PC goes to sleep (disabled the auto go to sleep), or if I just push the sleep button, it will freeze and have to hard reset. But apart from this, it's much more reliable system than 25.10 was for my hw. Sure, there are some bugs, but that was already on 25.10, but those are not critical.

The installation method: Renamed the .config/.local, and after the update finished, some apps config I just placed back to the correct folder, and that's it.

Hope sleep function will work as well in the long run, but for now, I am really happy that this update came along, I think the performance is better (maybe because of the kernel7), and it just works now.