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
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Any user can reboot or shutdown computer
https://bugs.launchpad.net/bugs/193569
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