I've just upgraded to Petra and I'm having problems with the repositories. When I try to use the update manager I get the error below and I can only restore a handful of the programs I was previously using on 15.
Does anyone know how to get out of this mess?
Thanks Owen
Could not download all repository indexes
The repository may no longer be available or could not be contacted because of network problems. If available, an older version of the failed index will be used. Otherwise, the repository will be ignored. Check your network connection and ensure the repository address is correct in 'Repositories' under 'Settings'.
Failed to fetch http://archive.canonical.com/ubuntu/dists/petra/partner/binary-amd64/Packages 404 Not Found [IP: 91.189.92.191 80]
Failed to fetch http://archive.canonical.com/ubuntu/dists/petra/partner/binary-i386/Packages 404 Not Found [IP: 91.189.92.191 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/petra-security/main/binary-amd64/Packages 404 Not Found [IP: 91.189.92.181 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/petra-security/restricted/binary-amd64/Packages 404 Not Found [IP: 91.189.92.181 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/petra-security/universe/binary-amd64/Packages 404 Not Found [IP: 91.189.92.181 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/petra-security/multiverse/binary-amd64/Packages 404 Not Found [IP: 91.189.92.181 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/petra-security/main/binary-i386/Packages 404 Not Found [IP: 91.189.92.181 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/petra-security/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.92.181 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/petra-security/universe/binary-i386/Packages 404 Not Found [IP: 91.189.92.181 80]
Failed to fetch http://security.ubuntu.com/ubuntu/dists/petra-security/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.92.181 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra/main/binary-amd64/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra/restricted/binary-amd64/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra/universe/binary-amd64/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra/multiverse/binary-amd64/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra/main/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra/universe/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra-updates/main/binary-amd64/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra-updates/restricted/binary-amd64/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra-updates/universe/binary-amd64/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra-updates/multiverse/binary-amd64/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra-updates/main/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra-updates/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra-updates/universe/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dists/petra-updates/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.91.14 80]
Some index files failed to download. They have been ignored, or old ones used instead.