W:Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/natty-updates/universe/binary-i386/Packages  404  Not Found [IP: 141.30.13.20 80]
W:Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/natty-updates/multiverse/binary-i386/Packages  404  Not Found [IP: 141.30.13.20 80]
E:Some index files failed to download. They have been ignored, or old ones used instead.