Thanks for the report. Please run sudo killall polkitd; sudo /usr/lib/policykit-1/polkitd And reproduce the problem. Then, copy/paste the output of the above command here.
Also, what's the output of apt-cache policy libpolkit-gobject-1-0 libpolkit-gtk-1-0 ** Changed in: gnome-system-tools (Ubuntu) Status: New => Incomplete ** Changed in: gnome-system-tools (Ubuntu) Importance: Undecided => Medium ** Summary changed: - date and time preferences cannot be edited when launched from the indicator + Polickit authentication error: Only trusted callers (e.g. uid 0) can use CheckAuthorization() and pass details -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/685655 Title: PolicyKit authentication error: Only trusted callers (e.g. uid 0) can use CheckAuthorization() and pass details -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs