DE broke during upgrade from 23.10 to 24.04 LTS

[jackmio]

I was running the GUI upgrade from 23.10 to 24.04 LTS, and it was interrupted when my desktop environment and basically any GUI broke. So far, I have done:
apt --fix-broken install (this was suggested by apt)
apt dist-upgrade

After this, I rebooted and landed at a broken (and different looking) login screen with no options to select what desktop session (Xorg or Wayland) I wanted to use, leaving me unable to log into my desktop. However, I was able to log into my user through a different terminal (ctrl+alt+F3, etc).

What could/should I do now?

[jackmio]

Update: It seems plasma and KDE packages got removed at some point, so I did apt install kde-standard, rebooted, and got to log into plasma on X11. Now trying to figure out how to get plasma on wayland working.

[claydoh]

Try the following:a

sudo dpkg --configure -a

This will attempt to finish installing anything that was not completely installed because of the interruption,
Note any errors shown.

Then

 sudo apt -f install

This tries to install the things that are missing.
Note any errors shown.

it doesn't hurt to try these again, if it has successfully installed and configured things, without errors.

Then try

sudo apt full-upgrade

[jackmio]

Thank you for the reply. It seems all broken packages got fixed, as

dpkg --configure -a

and

apt -f install

did not output that anything needed to be fixed. However, my install is still missing some things, mainly not being able to log in and use Plasma on Wayland (I would highly prefer to be using Wayland), and the lock screen on boot being completely different than usual.

[jackmio]

I have fixed the issue.

[Schwarzer Kater]

[…], mainly not being able to log in and use Plasma on Wayland (I would highly prefer to be using Wayland), […]

See e.g. https://www.kubuntuforums.net/forum/...805#post679805