This is the message it gives me:
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-i386/Packages 404 Not Found
E:Some index files failed to download. They have been ignored, or old ones used instead.