[all variants] is there a good server with GUI?

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http://ubuntuforums.org – I want to find a good linux distro that comes with a GUI. The server will be mainly a file server but I want to be able to experiment with other things too. The server is just a cheap old computer with a 1.4 ghz processor and 1gb of Ram. I am also looking for something easy to use as im still a newbie when it comes to anything thats not windows. (HowTos)