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Xubuntu and Ubuntu are two different versions of Ubuntu. (Ubuntu has GNOME.)
Ubuntu is best, but then I'm biased, as my computers all run Ubuntu!
Ubuntu is better in the management manner.
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techinfozone.net
Ubuntu was originated in South Africa in 2004,
founded by Mark Shuttleworth, you can read more about ubuntu @
Ubuntu is a free, supported debian/linux implementation of Unix. As such, you can do nearly anything that you can do in Unix in Ubuntu.