This award-winning operating system offers a cleaner, sharper design, together with new and enhanced desktop applications and advances in security.

http://www.ubuntu.com/getubuntu/download

What is Ubuntu?

Ubuntu is a community developed, linux-based operating system that is perfect for laptops, desktops and servers. It contains all the applications you need – a web browser, presentation, document and spreadsheet software, instant messaging and much more.
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