Trovato:1 http://it.archive.ubuntu.com/ubuntu artful InRelease
Trovato:2 http://it.archive.ubuntu.com/ubuntu artful-updates InRelease
Trovato:3 http://security.ubuntu.com/ubuntu artful-security InRelease
Trovato:4 http://it.archive.ubuntu.com/ubuntu artful-backports InRelease
Ign:5 http://archive.canonical.com/ubuntu utopic InRelease
Err:6 http://archive.canonical.com/ubuntu utopic Release
  404  Not Found [IP: 91.189.91.15 80]
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