I filed this bug because I have tried all known workarounds, but failed
to resolve the problem:
- appended to /etc/pam.d/lightdm
session required pam_loginuid.so
session required pam_systemd.so
- ran 'sudo pam-auth-update --force'
- reinstalled policykit-1 and libpam packages
-
Public bug reported:
After update from Precise to Trusty, I am unable to perform
administrative tasks through GUI (restart/shutdown, network management,
mount USB disks, start Synaptics package manager, etc.)
Even though it is checked in Startup Applications, polkit-gnome-
authentication-agent-1
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