problem to update ubuntu 12.10

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http://askubuntu.com – When trying to update Ubuntu, I receive the following failed error message. W:Failed to fetch http:// ppa.launchpad.net/sevenmachines/flash/ubuntu/dists/quantal/main/source/Sources 404 Not Found , W:Failed to fetch http:// ppa.launchpad.net/sevenmachines/flash/ubuntu/dists/quantal/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http:// ppa.launchpad.net/sevenmachines/flash/ubuntu/dists/quantal/main/binary-i386/Packages 404 Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead. Anyone could help me to solve that? (HowTos)