Possible Duplicate:
How to install software or upgrade from old unsupported release?
When running an update I get these errors:
:Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/karmic-backports/main/source/Sources 404 Not Found [IP: 91.189.92.201 80] , W:Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/karmic-backports/restricted/source/Sources 404 Not Found [IP: 91.189.92.201 80] ,
E:Some index files failed to download. They have been ignored, or old ones used instead.
There were more of the same kind of lines. How do I fix this?
