Ubuntu is an open source software platform that runs everywhere from the smartphone, the tablet and the PC to the server and the cloud.
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n00bs on Ubuntu is a blog about Ubuntu. The site contains tips, tricks, tweaks and much more Ubuntu related information.
A help and support forum for Ubuntu Linux.
Ubuntu Handbook -- News, Tutorials, Howtos for Ubuntu Linux
Xubuntu – Home page for Xubuntu, the elegant and easy-to-use operating system.