You can disable all the buttons in the gdmsetup. Go to System / Administration / Login Screen Setup (or "sudo gdmsetup"). On the Login "Local" tab, disable the property for the Action Menu. It is also possible to change single buttons. Check the file /etc/gdm/gdm.conf, search for AllowLogoutActions.
** Changed in: gdm (Ubuntu) Status: New => Invalid -- Any user can reboot or shutdown computer https://bugs.launchpad.net/bugs/193569 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