Unable to Upgrade from 13.04 to 13.10

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http://askubuntu.com – Following is what I get as error Error during update A problem occurred during the update. This is usually some sort of network problem, please check your network connection and retry. W:Failed to fetch http://bg.archive.ubuntu.com/ubuntu/dists/natty-backports/main/source/So... 404 Not Found , W:Failed to fetch http://bg.archive.ubuntu.com/ubuntu/dists/natty-backports/restricted/sou... 404 Not Found , W:Failed to fetch http://bg.archive.ubuntu.com/ubuntu/dists/natty-backports/universe/sourc... 404 Not Found , W:Failed to fetch http://bg.archive.ubuntu.com/ubunt (HowTos)