I assume that if you press Control-Alt-Delete just once, the machine reboots normally?
Could you run the following for me to confirm that you have the usual packages installed: dpkg-query -W upstart upstart-compat-sysv system-services startup- tasks Please note that the bug here is that the system stalls, rather than rebooting. The fact you get a root shell is intended behaviour, and is NOT a security problem -- the person has physical access to the machine, so could just reboot it and stick init=/bin/sh on the kernel command-line to get the same effect. ** Changed in: upstart (upstream) Status: Unconfirmed => Rejected ** Also affects: upstart (Ubuntu) Importance: Undecided Status: Unconfirmed -- Ctl+Alt+Del twice at tty console login gives root access https://launchpad.net/bugs/63852 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs