[Bug 54717] Re: No hibernate option when logging out

[Vassilis Pandis]

Gareth, this is a different issue. I *think* that users can only
shutdown/whatnot their computer if they are part of the 'adm' group -
I'm not sure. In any case, it's not a permission error because this was
present on a clean edgy installation, with me being the only user on the
system. Lukas points to a solution - I'll try it out.

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No hibernate option when logging out 
https://launchpad.net/bugs/54717