If you wanted to do this it is really pretty simple. Just know that it adds quite a bit to your "server" installation.
sudo apt-get install ubuntu-desktop
sudo apt-get install gdm
sudo /etc/init.d/gdm start
sudo dpkg-reconfigure xserver-xorg
Just a reminder that ubuntu-desktop is really an alias for a number of packages.
Voila. Have fun.
P.S. Want a slimmed down gnome desktop? This should get you started: http://doc.gwos.org/index.php/LightweightGnome
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