I've got often this error on just one server:
Err http://de.archive.ubuntu.com precise/universe amd64 Packages
404 Not Found [IP: 141.30.13.20 80]
But there was no problem with the network connection or the de.archive.ubuntu.com server.
After I deleted the local lists cache with rm -r /var/lib/apt/lists it works again.
Posted by Kim Klotz to makandra dev (2012-07-05 09:53)