I have experienced the same troubles with mounting drives, using
shutdown/restart etc... since lightdm upgrade to 1.8.
I have found that keeping libpam-systemd installed and running
pam-auth-update --force
then selecting only "Unix Authentication" solves the problem.
The previous solutions (removing libpam-systemd or commenting a line in
/etc/pam.d/common-session) also worked but created some troubles with
libGL (also authentication problems).
I hope it helps
Louis
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