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
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Ctl+Alt+Del twice at tty console login gives root access
https://launchpad.net/bugs/63852
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