Ubuntu Server GUI

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http://www.ubuntux.org – Hi Everybody, Recently I had a problem with my MS Exchange server, and I'm tired of windows crashing every two days so I installed Ubuntu Server ver. 10.04. But I'm new for Linux so I wanted to install The GUI part But every time I tried it has an error message of 'E: Package could not found.' I even tried all the commands that are avelabel on the net like " sudo apt-get install ubuntu-desktop" AND EVEN I TRIED sudo apt-cdrom add, but still the error appears. any body has an idea what is the problem? Thanks in Advance for the Help. (Distributions)