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I recently upgraded to Ubuntu 14.04 from 13.10, and when I am logged in the shut down dialog box has the correct buttons that you can click - but from the login screen, there are no buttons to click.

Due to being new here, the screenshot is available separately: enter image description here

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Have you tried shutting down via command line? – MrLizard May 9 '14 at 3:54
To clarify this further, command-line shutdown works if I log in with root privileges - but these buttons are missing when nobody is logged in. – danznz May 11 '14 at 23:29
up vote 0 down vote accepted

In the file /etc/pam.d/common-session add:

session optional

This seems to have been missed during one of the upgrades this system has gone through.


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