can you check if gdm is running on the server, and if gnome-power-manager is 
running in the users session ? 
the gnome logout dialog queries gnome-power-manager first for suspend hibernate 
capabilities and also uses gdm-signal. if neither answers that can cause the 
logout dialog to not appear.

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Gnome not logging out with Edubuntu LTSP as a thin client
https://bugs.launchpad.net/bugs/173244
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Desktop Bugs, which is a bug contact for gdm in ubuntu.

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