У меня есть следующая ошибка
Failed to Download repository information
Check your Internet connection..
W:Failed to fetch http://ppa.launchpad.net/mozillateam/firefox-stable/ubuntu/dists/oneiric/main/source/Sources/dists/oneiric/main/source/Sources 404 Not Found
W:Failed to fetch http://ppa.launchpad.net/mozillateam/firefox-stable/ubuntu/dists/oneiric/main/source/Sources/dists/oneiric/main/binary-i386/Packages 404 Not Found