Missing Shutdown button in Gnome System Menu

[Paul Wellner Bou <paul purecodes org>]

Hi,

My Shutdown button is missing the gnome system menu. I am using Debian 
Unstable. First I thought this was a kind of bug, but it seems to work 
on other systems running debian unstable so it has to do with my machine.

The shutdown button is missing if I login as another user, too. So it 
does not seem to depend on my user configuration.

I am running GDM and I can shutdown via GDM. The Actions are enabled in 
the login window configuration.

I don't know what packages are needed for the shutdown via gnome menu 
and what the causes can be. Any hints?

Thanks and regards
Paul.