If you’re using a normal version of Ubuntu such as Saucy, Raring, Quantal, Oneiric, Natty, Maverick, etc, you may have already (and will eventually) start getting “Failed to fetch 404 Not Found” errors when trying to run  apt-get update , or even sometimes running apt-get install , but fear not, it is easy to fix, and here’s how… 204 more words