This is fixed in karmic with the new gnome-session and gdm2. It now asks for policykit confirmation if multiple users are logged in. Only then is a shutdown possible.
** Changed in: update-notifier (Ubuntu) Status: Confirmed => Fix Released -- restart by unauthorized user after updates https://bugs.launchpad.net/bugs/363269 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs