Ubuntu
- The operating system for PCs, IoT devices, servers and the cloud | Ubuntu Official
https://www.ubuntu.com/
Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. - Ask Ubuntu
https://askubuntu.com/
Q&A for Ubuntu users and developers - Ubuntu Forums
http://ubuntuforums.org/
A help and support forum for Ubuntu Linux. - Wiki | [Ubuntu Česko]
http://wiki.ubuntu.cz/
sbírka návodů a dokumentace k oblíbenému operačnímu systému Ubuntu