Hmm...
W: Failed to fetch http://ppa.launchpad.net/ubuntu-audio-dev/ppa/ubuntu/dists/natty/main/source/Sources 404 Not Found W: Failed to fetch http://ppa.launchpad.net/ubuntu-audio-dev/ppa/ubuntu/dists/natty/main/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead.
Hmm...
W: Failed to fetch http:// ppa.launchpad. net/ubuntu- audio-dev/ ppa/ubuntu/ dists/natty/ main/source/ Sources 404 Not Found ppa.launchpad. net/ubuntu- audio-dev/ ppa/ubuntu/ dists/natty/ main/binary- i386/Packages 404 Not Found
W: Failed to fetch http://
E: Some index files failed to download. They have been ignored, or old ones used instead.