every time i run sudo apt-get update the following error occurs .
W: Failed to fetch http://ppa.launchpad.net/ackondro/tibesti/ubuntu/dists/quantal/main/source/Sources 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/ackondro/tibesti/ubuntu/dists/quantal/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/ackondro/tibesti/ubuntu/dists/quantal/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/cooperjona/stormcloud/ubuntu/dists/quantal/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/cooperjona/stormcloud/ubuntu/dists/quantal/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/gnome-split-team/ppa/ubuntu/dists/quantal/main/source/Sources 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/gnome-split-team/ppa/ubuntu/dists/quantal/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/gnome-split-team/ppa/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.
this dose not bother me that much , but i would be very happy if i could get it fixed.
Thanks!
