Closing the bug since that works fine now. That was probably an user configuration option like "SystemMenu=false" being used. Feel free to reopen with /etc/gdm/gdm.conf and /etc/gdm/gdm-custom.conf attached (feel free to replace private datas by random chars by example) if you get the issue again
** Changed in: gdm (Ubuntu) Status: Needs Info => Rejected -- GDM missing half of it's menu, no way to shutdown except with the command line https://launchpad.net/bugs/45320 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs