I have been observing this problem on several machines too - disabled
restart/ shutdown/ standby/ suspend buttons in xfce4 after upgrading
lightdm to 1.8.2. When that happened, trying to start programs using
pkexec from the GUI also stopped working. Subsequent updates to lightdm
(namely 1.8.3 and 1.8.5) didn't fix the problem. On some of the machines
I am maintaining, lightdm and xfce4 kept working properly - with the
same versions that caused problems on the others.
Following this thread I verified the various things suggested, and noted
that ck-list-sessions was unable to find the correct X session.
Today I digged further, and found the difference between the working
machines and the non-working ones. The non-working ones had an extra
entry in /etc/pam.d/common-session:
session optional pam_systemd.so
This entry gets placed there by the package libpam-systemd. Removing
this entry fixed the problem here. The working machines didn't have
libpam-systemd installed, so I uninstalled it from all of them.
--
Mit freundlichen Grüßen / Best Regards
Jens Arnold
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