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 Ubuntu distributions 
  
13.04, 12.10, 12.04, 11.10, 11.04  -- The Ubuntu version numbering scheme is based on the date 
of the release of the distribution, April 2013, October 2012, April 2012, October 2011, etc
  
12.04 LTS -- The LTS means long-term support (5 years for server and 3 years for desktop). 
  
Release -- Server and Desktop editions. They have similar packages, but different kernels.
 The server may have no X-desktop environment installed.   
  
Supported architectures -- x86 (32 bit) and x86_64 (64 bit). 
  
 
	
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