https://bugs.launchpad.net/ubuntu/+source/glib2.0/+bug/1926316 is the
bug which is causing this problem. A fix is committed but it hasn't been
released yet for 21.04, and apparently has some test failures in the
proposed queue. In installed the pre-release files from
https://launchpad.net/ubuntu/+s
The problem seems to be /usr/lib/lxdm/lxdm-greeter-gtk crashing at
g_key_file_load_from_file(). Also, lxappearance crashes similarly. This
may be related: https://gitlab.gnome.org/GNOME/glib/-/issues/2361 . But
the crash seems to be triggered by plasma.desktop and twm.desktop in
/usr/share/xsession
The same problem happens on my main PC (with GeForce GT 710 graphics and
460.56-0ubuntu1 driver). I'm now using sddm instead of lxdm on both
systems.
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https://bugs.launchpad.net/bugs/19224
