Ubuntu
What is Ubuntu?
The world's favourite Linux distribution!
Ubuntu has become very popular in recent years. It is renowned as a stable, reliable and easy to use Linux distribution (it's based on Debian) and is often used itself as a base for other distributions.
You'll certainly find it useful as a server and as a desktop too. There is even an education specific version called Edubuntu.
Visit the Ubuntu site to learn more and to get the latest version.