Dear Maintainer,

After a recent upgrade from Buster -> Bullseye I was experiencing issues
KDE Plasma: It took an extremely long time for the login process and
opening a new session to complete, and running sessions lacked window
controls because kwin_x11 was not running.  Eventually the Plasma
session would crash and freeze.

I noticed by checking running processes on the system that multiple
lxqt-* processes were running.  I eventually traced these to
/etc/xdg/autostart.  Not sure how or why all the lxqt-* entries were
there but I removed them.

However even after removing them lxqt-session was still automatically
starting after system boot, causing problems for KDE Plasma.

Eventually I just apt purged lxqt-session.

I have no insight into why this was happening but it was a fairly severe
issue that prevented me from using KDE.