This appears to be fixed in Intrepid. With a guest session logged in,
even from my own admin capable account I was given a warning that other
users were logged in, and required to authenticate to initiate a reboot.
** Changed in: gdm (Ubuntu)
Status: Confirmed => Fix Released
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Any user can reboot or shutdown computer when screen is locked
https://bugs.launchpad.net/bugs/153706
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