Here are the references used in this tutorial... http://en.wikipedia.org/wiki/Ubuntu_(operating_system) http://www.techsoup.org/learningcenter/software/page7858.cfm http://en.wikipedia.org/wiki/Ubuntu_(operating_system)#History_and_development_process http://www.techdrivein.com/2011/01/evolution-of-ubuntu-over-years-brief.html http://www.helium.com/knowledge/211823-know-more-about-ubuntu http://en.wikipedia.org/wiki/List_of_Ubuntu_releases http://en.wikipedia.org/wiki/List_of_Linux_distributions#Ubuntu-based http://lifehacker.com/5355900/five-features-we-want-to-see-in-ubuntu https://help.ubuntu.com/8.04/basic-commands/C/
