Various version's of Ubuntu .

Ubuntu is one of the Free Open Source Operating Systems, which is commonly used like windows or Macintosh . Ubuntu may not be a user friendly operating system since many programmers prefer the OS Ubuntu because of it's beauty and elegance . I wish to comment here that, prefer Ubuntu OS instead any thing even Mac or Windows, you will learn lot of things . 

Ubuntu an Operating System introduced by canonical Ltd/Ubuntu community . 

List of Ubuntu operating System via Wikipedia . 

Version Code name Release date Supported until Kernel Version Desktops Servers 4.10 Warty Warthog 20 October 2004 30 April 2006 2.6.8 5.04 Hoary Hedgehog 8 April 2005 31 October 2006 2.6.10 5.10 Breezy Badger 13 October 2005 13 April 2007 2.6.12 6.06 LTS Dapper Drake 1 June 2006 14 July 2009 1 June 2011 2.6.15 6.10 Edgy Eft 26 October 2006 25 April 2008 2.6.17 7.04 Feisty Fawn 19 April 2007 19 October 2008 2.6.20 7.10 Gutsy Gibbon 18 October 2007 18 April 2009 2.6.22 8.04 LTS Hardy Heron 24 April 2008 12 May 2011 April 2013 2.6.24 8.10 Intrepid Ibex 30 October 2008 30 April 2010 2.6.27 9.04 Jaunty Jackalope 23 April 2009 23 October 2010 2.6.28 9.10 Karmic Koala 29 October 2009 30 April 2011 2.6.31 10.04 LTS Lucid Lynx 29 April 2010 April 2013 April 2015 2.6.32 10.10 Maverick Meerkat 10 October 2010 10 April 2012 2.6.35 11.04 Natty Narwhal 28 April 2011 October 2012 2.6.38 11.10 Oneiric Ocelot 13 October 2011 April 2013 3.0.4 12.04 LTS Precise Pangolin 26 April 2012[151] April 2017[135] 3.2.0 12.10 Quantal Quetzal 18 October 2012 April 2014 TBD

Colour	Meaning
Red	Release no longer supported
Green	Release still supported
Blue	Future release

TDB - To Be Announced . 

I have used nearly 6 version and i saw the real development in the look, feel, core and i can say Ubuntu 10.04 is the best of all releases . I don't like Ubuntu 11.04 because of Unity panel, openly saying unity sucks . 

Later , .