Failed to fetch http://extras.ubuntu.com/ubuntu/dists/natty/main/source/Sources  404  Not Found
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty/universe/binary-i386/Packages  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty/multiverse/binary-i386/Packages  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/restricted/source/Sources  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://extras.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages  404  Not Found
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty-updates/restricted/source/Sources  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty-updates/main/source/Sources  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty-updates/multiverse/source/Sources  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty-updates/universe/source/Sources  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty-updates/main/binary-i386/Packages  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty-updates/restricted/binary-i386/Packages  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty-updates/universe/binary-i386/Packages  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty-updates/multiverse/binary-i386/Packages  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/main/source/Sources  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/multiverse/source/Sources  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/universe/source/Sources  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/restricted/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/main/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/multiverse/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/universe/binary-i386/Packages  404  Not Found [IP: 91.189.92.201 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty/restricted/source/Sources  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty/main/source/Sources  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty/multiverse/source/Sources  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty/universe/source/Sources  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages  404  Not Found [IP: 91.189.92.156 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/natty/restricted/binary-i386/Packages  404  Not Found [IP: 91.189.92.156 80]
Some index files failed to download. They have been ignored, or old ones used instead.