Failed to fetch http://dev.realistanew.com/beryl/dists/edgy/beryl/binary-i386/Packages.gz  404 Not Found
Failed to fetch http://beryl-mirror.lupine.me.uk/beryl/dists/edgy/beryl/binary-i386/Packages.gz  404 Not Found
W: GPG error: http://beryl-mirror.lupine.me.uk edgy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 31A5F97FED8A569E
W: You may want to run apt-get update to correct these problems
E: Some index files failed to download, they have been ignored, or old ones used instead.