How can I fix a 404 Error using a PPA?
When I try the software updater, it tells me that it
Failed to download Repository Information and I
should check my internet connection. Of course my internet works. The error it reproduces is below
W:GPG error: http://www.duinsoft.nl debs Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E18CE6625CB26B26, W:Failed to fetch http://ppa.launchpad.net/eugenesan/java/ubuntu/dists/quantal/main/source/Sources 404 Not Found, W:Failed to fetch http://ppa.launchpad.net/eugenesan/java/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.`
How do I fix this?