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use ubuntu operating system - "Fast, secure and stylishly simple, the Ubuntu operating system is used by 20 million people worldwide every day"
is open or free as in freedom
also there is other flavors of ubuntu kubuntu, xubuntu,..
Overview · Web browsing · Office applications · Social and email · Music and mobile · Photos and videos · Ubuntu Software Centre · Ubuntu One · What's new? Why use Ubuntu? Why is it free? Business...
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