W: Failed to fetch http://ppa.launchpad.net/bzr/ppa/ubuntu/dists/wily/main/source/Sources 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/bzr/ppa/ubuntu/dists/wily/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/bzr/ppa/ubuntu/dists/wily/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
W: Failed to fetch http:// ppa.launchpad. net/bzr/ ppa/ubuntu/ dists/wily/ main/source/ Sources 404 Not Found
W: Failed to fetch http:// ppa.launchpad. net/bzr/ ppa/ubuntu/ dists/wily/ main/binary- amd64/Packages 404 Not Found
W: Failed to fetch http:// ppa.launchpad. net/bzr/ ppa/ubuntu/ dists/wily/ main/binary- i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.