This site is where you can find the official documentation developed and maintained by the Ubuntu Documentation Project. For previews of work in progress, and to learn how to contribute, please see doc.ubuntu.com.
Browse the documentation currently available using the bar on the right hand side of the page!
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If you can't find what you are looking for here, try the excellent source of documentation on the Ubuntu wiki, also maintained by the Documentation Team.
These links all lead to the Ubuntu wiki:
DocteamLicense - The license used for the documentation produced by the team.
DocteamCommunications - Our methods of communication. (Internet Relay Chat and mailing lists)