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I did mine by Restoring sources.list. I did it by copying contents of sources.list. if you can find default sources.list for your version, this command followed by copy paste will work. else follow the link to store default. Good Luck

sudo gedit /etc/apt/sources.list

http://askubuntu.com/questions/586595/restore-default-apt-repositories-in-sources-list-from-command-line

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