I updated to 12.04 a week ago. Everything is fine, However when I recently tried to update by using the update manager, The update stopped and I received the error message:
Failed to download repository information
The following details were given:
W:Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/precise/main/source/Sources 404 Not Found [IP: 18.104.22.168 80] , W:Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/precise/universe/source/Sources 404 Not Found [IP: 22.214.171.124 80] , E:Some index files failed to download. They have been ignored, or old ones used instead.
What can I do?