信息来源:

Ubuntu_Wikipedia

The Ubuntu project makes two releases per year, using the year and month of the release as the version number. The first Ubuntu release, for example, was Ubuntu 4.10 and was released on October 20, 2004.^[44] Consequently, version numbers for future versions are provisional; if the release is delayed until a different month to that planned, the version number changes accordingly.

Ubuntu releases are also given code names, using an adjective and an animal with the same first letter e.g: "Dapper Drake" and "Intrepid Ibex". With the exception of the first two releases, code names are in alphabetical order, allowing a quick determination of which release is newer. Commonly, Ubuntu releases are referred to using only the adjective portion of the code name.^[45]

Releases are timed to be approximately one month after GNOME releases, which are in turn about one month after releases of X.org. Consequently, every Ubuntu release comes with a newer version of both GNOME and X. Release 6.06 (Dapper Drake)—and recently 8.04 (Hardy Heron)—have been labeled as a Long Term Support (LTS), to indicate support with updates for three years on the desktop and five years on the server, with paid technical support available from Canonical Ltd.^[46] Ubuntu 9.04 Desktop was released on April, 23 2009. It includes the latest enhancements and is maintained until October 2010.

Color	Meaning
Red	No longer supported release
Green	Supported release
Blue	Future release

#	Version	Code name	Testing name	Release date	Supported until
					Desktops	Servers
1	4.10	Warty Warthog	Sounder[47]	2004-10-20[44]	2006-04-30.[48]
2	5.04	Hoary Hedgehog	Array[49]	2005-04-08[26]	2006-10-31[50]
3	5.10	Breezy Badger	Colony	2005-10-13[51]	2007-04-13[52]
4	6.06 LTS	Dapper Drake	Flight	2006-06-01[53][54]	June 2009	June 2011
5	6.10	Edgy Eft	Knot	2006-10-26[55][56]	2008-04-25[57]
6	7.04	Feisty Fawn	Herd	2007-04-19[58]	2008-10-19[59]
7	7.10	Gutsy Gibbon	Tribe	2007-10-18[60][61]	2009-04-18[62]
8	8.04 LTS	Hardy Heron[63]	Alpha	2008-04-24[64]	April 2011	April 2013
9	8.10	Intrepid Ibex[65]	Alpha	2008-10-30[66]	April 2010
10	9.04	Jaunty Jackalope[67]	Alpha	2009-04-23	October 2010
11	9.10	Karmic Koala[68]	Alpha	2009-10-29	April 2011

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