The issue solved by reinstalling package policykit-1: sudo apt-get install --reinstall policykit-1
-- Polkit authentication fails in Lubuntu https://bugs.launchpad.net/bugs/599050 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-system-tools in ubuntu. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
