W: Failed to fetch http://ppa.launchpad.net/snappy-dev/beta/ubuntu/dists/wily/main/binary-amd64/Packages  404  Not Found

W: Failed to fetch http://ppa.launchpad.net/snappy-dev/beta/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.