Kubuntu 25.10 Plasma Beta Upgrade Broke Desktop – No Sessions / kubuntu-desktop Missing

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1

TL;DR:

Accidentally upgraded to Kubuntu 25.10 Plasma 6 beta. After reboot: no login sessions, startplasma-wayland missing, kubuntu-desktop removed. Beta repo removed, but reinstall fails due to dependency conflicts. Root is on a single partition. Need help restoring stable Plasma 6.4.5 safely via TTY/Live USB.

Hi all,

I ran into a major issue after accidentally upgrading to the latest Plasma 6 beta on Kubuntu 25.10. Here’s the situation:

After reboot, the login screen shows no session options. Entering my password just loops back to the login screen.

startplasma-wayland is not found from TTY.

Kernel: 6.17.0-6-generic

I removed the beta repo and tried to reinstall kubuntu-desktop, but apt gives dependency errors that I can’t resolve.

My root partition contains everything (no separate /home).

It seems like kubuntu-desktop and some core Plasma packages got removed or mismatched after the beta reboot. I’ve tried:

Recovery mode → “Repair broken packages” (didn’t help)

apt --fix-broken install

Attempting to reinstall kubuntu-desktop

I suspect it’s a mix of leftover beta packages conflicting with the stable ones.

I’d really appreciate guidance on:

1. Safely restoring kubuntu-desktop and Plasma 6.4.5 without wiping /home.

2. Identifying which beta packages need to be downgraded.

3. Any recommended commands or procedures for fixing this via TTY or Live USB chroot.

Thanks in advance for any help!

2

Is anyone gonna help me?

3

How did you get Plasma 6 beta on Kubuntu?

Also, did you try sudo aptitude install kubuntu-desktop? There should be options there on how to best proceed

1 Like
4

I will try the aptitude command when i can, thank you

5

It says No solution found. Try harder? (Y/n)

And I said y, it scanned and popped up again and after typing y like 50 times it didnt find a solution, so i gave up. To answer your question, i installed the beta because i wanted to install a package that was only in the beta PPA, so i added the beta PPA and i thought i removed it after, so later, i clicked update all in Discover and it rebooted in the beta. I removed the beta really after, so i rebooted again to see that kubuntu-desktop doesn’t exist

6

Did you re-run sudo apt update?

Can you post a screenshot or log output when you do sudo apt install kubuntu-desktop?

7

I wish i could send you a screenshot while in a TTY…

8

High quality pictures should help