W:Failed to fetch (http://)ppa.launchpad.net/webupd8team/mintmenu/ubuntu/dists/oneiric/main/source/Sources 404 Not Found W:Failed to fetch (http://)ppa.launchpad.net/webupd8team/mintmenu/ubuntu/dists/oneiric/main/binary-amd64/Packages 404 Not Found W:Failed to fetch (http://)ppa.launchpad.net/webupd8team/mintmenu/ubuntu/dists/oneiric/main/binary-i386/Packages 404 Not Found E:Some index files failed to download. They have been ignored, or old ones used instead.
for quite some time now i get the same error again and again, while the main update within ubuntu (11.10) update manager works just fine. after every update when i use the "check" function, due to the text in the managers header: "the package information was last updated 95 days ago. press the "check" button below, to check for new software updates, i get the packages errors as stated above. i know for sure, that the online-connection is not the culprit in this case.
does anyone how to fix it maybe?! thank you.