Ubuntu 版本開發號
假設三位數字版本為 a.bc，實際 a 代表的就是發布年份的最後一份，bc 則是正式版本發布時的月份，就是Y.MM。
Ubuntu 4.10 - Warty Warthog (Released October 20th, 2004)
Ubuntu 5.04 - Hoary Hedgehog (Released April 8th, 2005)
Ubuntu 5.10 - Breezy Badger (Released October 13th, 2005)
Ubuntu 6.06 - Dapper Drake (Released June 1th, 2006) (LTS, Long Term Support)。
Ubuntu 6.10 - Edgy Eft (Released October 6th, 2006)
Ubuntu 7.04 - Feisty Fawn (Released April 19th, 2007)
Ubuntu 7.10 - Gutsy Gibbon (Released October 18th, 2007)
Ubuntu 8.04 - Hardy Heron (Released April 24th, 2008)（LTS）
對於長期支持版本，Ubuntu會提供長期的安全更新支持，桌面為3年，服務器長達5年之久。由於穩定安全和豐富的軟件庫，到現在還是有很多人在使用6.06版本。“大約每兩年”發布一個LTS版本。The first official release of Ubuntu was made in October 2004 and was duly named Version 4.10, thus introducing the Y.MM numbering system. While under development, Version 4.10 was affectionately known as "the Warty Warthog," a name which continued to live on past the time when most development codenames die. Every release since then has had a similarly alliterative codename.
