Possible Duplicate:
How to install software or upgrade from old unsupported release?

Is the upgrade server working? Im upgrading from 8.10 to 9.04 and it says "extracting the upgrade failed there may be a problem with the network or the server." Also when I hit check it says "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 in the preferences is correct."

and

Failed to fetch http://security.ubuntu.com/ubuntu/dists/intrepid-security/main/binary-i386/Packages.gz 404 Not Found [IP: 91.189.92.184 80]

and then a bunch more failed to fetch