На свой слабенький нетбук Lenovo S100 установил Минт 12 LXDE. При попытке обновления выходит ошибка
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://packages.medibuntu.org oneiric InRelease: File /var/lib/apt/lists/partial/packages.medibuntu.org_dists_oneiric_InRelease doesn't start with a clearsigned message
W: Failed to fetch http://packages.medibuntu.org/dists/oneiric/InRelease
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/main/binary-i386/Packages 404 Not Found [IP: 91.189.88.152 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.88.152 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/universe/binary-i386/Packages 404 Not Found [IP: 91.189.88.152 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/oneiric-security/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.88.152 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/main/binary-i386/Packages 404 Not Found [IP: 91.189.88.162 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.88.162 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/universe/binary-i386/Packages 404 Not Found [IP: 91.189.88.162 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.88.162 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/main/binary-i386/Packages 404 Not Found [IP: 91.189.88.162 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.88.162 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/universe/binary-i386/Packages 404 Not Found [IP: 91.189.88.162 80]
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/oneiric-updates/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.88.162 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.
Как ее устранить? Также не могу установить ничего из Синаптика ((