W: Failed to fetch http://ppa.launchpad.net/canonical-dx-team/une/ubuntu/dists/precise/main/source/Sources  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/canonical-dx-team/une/ubuntu/dists/precise/main/binary-i386/Packages  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/artfwo/ppa/ubuntu/dists/precise/main/binary-i386/Packages  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.