I'm trying to upgrade from 10.04 to 10.10 and up. I am currently connected to the Internet. The last thing that I want to have to do is a fresh install since I dual boot the machine and I don't want to risk anything. Any suggestions or help would be greatly appreciated.

I have been getting the following error:

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.



Failed to fetch <http://us.archive.ubuntu.com/ubuntu/dists/karmic-backports/restricted/binary-i386/Packages.gz [and sources.gz]>  404  Not Found [IP: 91.189.91.15 80]

Failed to fetch <see above>  404  Not Found [IP: 91.189.91.15 80]

Failed to fetch <see above>  404  Not Found [IP: 91.189.91.15 80]

Failed to fetch <see above>  404  Not Found [IP: 91.189.91.15 80]

Failed to fetch <see above>  404  Not Found [IP: 91.189.91.15 80]

Failed to fetch <see above>  404  Not Found [IP: 91.189.91.15 80]

Failed to fetch <see above>  404  Not Found [IP: 91.189.91.15 80]

Failed to fetch <see above>  404  Not Found [IP: 91.189.91.15 80]

Some index files failed to download, they have been ignored, or old ones used instead.