How to install software or upgrade from old unsupported release?
While I'm upgrading my Ubuntu from 12.04 to 12.10 the following error is occurred in distribution upgrade,
W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/maverick/main/source/Sources
404 Not Found
E:Some index files failed to download. They have been ignored, or old ones used instead
Does anybody know whats happening?