If you have installed your system via netinstall or by selecting packages one by one, or if you somehow removed some gnome packages, you may be missing some menu items. I noticed that I did not have some entries in System>Administration menu, namely, “Network”, “Services”, “Time and Date” and “Users and Groups”. I tried to search for them in Synaptic and Apt-file but failed to locate the exact package. So, I did some hit and trial and found the package was “gnome-system-tools”. I just installed it via synaptic and the menu entries were back.
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