Ubuntu Free download link

http://www.ubuntu.com/download

http://download.cnet.com/1770-20_4-0.html?query=ubuntu+desktop&searchtype=downloads

http://www.tucows.com/preview/609395

http://www.filecluster.com/Security/Other-Utilities/Download-Ubuntu.html

http://download.cnet.com/Ubuntu/3000-18513_4-170729.html

http://ubuntu.en.softonic.com/