There are some commits from March 4 2016 that are supposed to fix this problem.
** Package changed: gnome-shell (Ubuntu) => gnome-session (Ubuntu) ** Changed in: gnome-session (Ubuntu) Importance: Undecided => High ** Changed in: gnome-session (Ubuntu) Status: Expired => Triaged -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-session in Ubuntu. https://bugs.launchpad.net/bugs/1575434 Title: Shutdown/Restart prompt may stop working To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-session/+bug/1575434/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs