Hi Norbert,
Does the script also contain the part of the re-installation?
Unfortunately no, the script only contains the upgrade to bullseye, but after that I rebooted and did not record the reinstall.
All that is really difficult to debug, though ...
Indeed. I now also installed a new virtual machine with buster, then tried to somewhat mimic which packages I have installed, and upgraded to bullseye. No problems this time, KDE worked fine.
So if nobody besides me reports this, maybe this bug should just be closed?
best, Malvin