Comment # 11 on bug 1229061 from Marc Chamberlin

I have found an (ugly) workaround for this bug, from doing more internet
searches. If at the login prompt, set the desktop session selection to
Plasma(X11), do a cntl-alt-F3 to bring the run-level to 3, log in as me and
then run startx, the system will come up ok running the Plasma(X11) desktop.

Please don't consider this an isolated problem that only I am experiencing. I
have upgraded another system from OpenSuSE 15.4 to 15.5 and it too is now
experiencing this problem. My internet searches revealed that quite a number of
people are also searching for a solution to this problem.

Another workaround that was discussed is to not upgrade but to do a complete
new installation. That works for some, but for those of us who have mounted
partitions and then want to mount them again in the new installations, things
like UUIDs and GUIDs get messed up causing real insidious problems to try and
track down and fix. I have never been able to figure out how to sync those from
one installation to another new installation. The only way I know of that
works, is if I do an upgrade, so a new installation is not an option.

This bug really needs to be fixed, a lot of us are running applications such as
x11vnc and nvidia-settings (and personally for me all my telescope control
software) that only work under an X11 session.