$ gpg --keyserver  keyserver.ubuntu.com --recv-keys 40976EAF437D05B5 && gpg --export --armor | sudo apt-key add - && sudo apt-get  update
gpg: richiesta della chiave 437D05B5 dal server hkp keyserver.ubuntu.com
gpg: chiave 437D05B5: chiave pubblica «Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>» importata
gpg: non è stata trovata alcuna chiave definitivamente affidabile
gpg: Numero totale esaminato: 1
gpg:               importate: 1
OK
Trovato http://archive.canonical.com lucid Release.gpg
Ign http://archive.canonical.com/ubuntu/ lucid/partner Translation-it
Scaricare:1 http://it.archive.ubuntu.com lucid Release.gpg [189B]
Trovato http://security.ubuntu.com lucid-security Release.gpg
Ign http://security.ubuntu.com/ubuntu/ lucid-security/main Translation-it
Ign http://security.ubuntu.com/ubuntu/ lucid-security/restricted Translation-it
Trovato http://archive.canonical.com lucid Release
Scaricare:2 http://ppa.launchpad.net lucid Release.gpg [316B]
Ign http://ppa.launchpad.net/mscore-ubuntu/mscore-stable/ubuntu/ lucid/main Translation-it
Ign http://security.ubuntu.com/ubuntu/ lucid-security/universe Translation-it
Ign http://security.ubuntu.com/ubuntu/ lucid-security/multiverse Translation-it
Trovato http://security.ubuntu.com lucid-security Release
Trovato http://it.archive.ubuntu.com/ubuntu/ lucid/main Translation-it
Trovato http://archive.canonical.com lucid/partner Packages
Trovato http://ppa.launchpad.net lucid Release
Trovato http://security.ubuntu.com lucid-security/main Packages
Ign http://ppa.launchpad.net lucid Release
Trovato http://security.ubuntu.com lucid-security/restricted Packages
Trovato http://security.ubuntu.com lucid-security/universe Packages
Trovato http://security.ubuntu.com lucid-security/multiverse Packages
Trovato http://ppa.launchpad.net lucid/main Packages
Trovato http://it.archive.ubuntu.com/ubuntu/ lucid/restricted Translation-it
Trovato http://it.archive.ubuntu.com/ubuntu/ lucid/universe Translation-it
Trovato http://it.archive.ubuntu.com/ubuntu/ lucid/multiverse Translation-it
Trovato http://it.archive.ubuntu.com lucid-updates Release.gpg
Ign http://it.archive.ubuntu.com/ubuntu/ lucid-updates/main Translation-it
Ign http://it.archive.ubuntu.com/ubuntu/ lucid-updates/restricted Translation-it
Ign http://it.archive.ubuntu.com/ubuntu/ lucid-updates/universe Translation-it
Ign http://it.archive.ubuntu.com/ubuntu/ lucid-updates/multiverse Translation-it
Trovato http://it.archive.ubuntu.com lucid-backports Release.gpg
Ign http://it.archive.ubuntu.com/ubuntu/ lucid-backports/main Translation-it
Ign http://it.archive.ubuntu.com/ubuntu/ lucid-backports/restricted Translation-it
Ign http://it.archive.ubuntu.com/ubuntu/ lucid-backports/universe Translation-it
Ign http://it.archive.ubuntu.com/ubuntu/ lucid-backports/multiverse Translation-it
Trovato http://it.archive.ubuntu.com lucid-proposed Release.gpg
Trovato http://it.archive.ubuntu.com/ubuntu/ lucid-proposed/restricted Translation-it
Trovato http://it.archive.ubuntu.com/ubuntu/ lucid-proposed/main Translation-it
Trovato http://it.archive.ubuntu.com/ubuntu/ lucid-proposed/multiverse Translation-it
Trovato http://it.archive.ubuntu.com/ubuntu/ lucid-proposed/universe Translation-it
Trovato http://it.archive.ubuntu.com lucid Release
Ign http://it.archive.ubuntu.com lucid Release
Trovato http://it.archive.ubuntu.com lucid-updates Release
Trovato http://it.archive.ubuntu.com lucid-backports Release
Trovato http://it.archive.ubuntu.com lucid-proposed Release
Trovato http://it.archive.ubuntu.com lucid/main Packages
Trovato http://it.archive.ubuntu.com lucid/restricted Packages
Trovato http://it.archive.ubuntu.com lucid/universe Packages
Trovato http://it.archive.ubuntu.com lucid/multiverse Packages
Trovato http://it.archive.ubuntu.com lucid-updates/main Packages
Trovato http://it.archive.ubuntu.com lucid-updates/restricted Packages
Trovato http://it.archive.ubuntu.com lucid-updates/universe Packages
Trovato http://it.archive.ubuntu.com lucid-updates/multiverse Packages
Trovato http://it.archive.ubuntu.com lucid-backports/main Packages
Trovato http://it.archive.ubuntu.com lucid-backports/restricted Packages
Trovato http://it.archive.ubuntu.com lucid-backports/universe Packages
Trovato http://it.archive.ubuntu.com lucid-backports/multiverse Packages
Trovato http://it.archive.ubuntu.com lucid-proposed/restricted Packages
Trovato http://it.archive.ubuntu.com lucid-proposed/main Packages
Trovato http://it.archive.ubuntu.com lucid-proposed/multiverse Packages
Trovato http://it.archive.ubuntu.com lucid-proposed/universe Packages
Recuperati 505B in 12s (40B/s)
Lettura elenco dei pacchetti... Fatto
W: Errore GPG: http://ppa.launchpad.net lucid Release: Le seguenti firme non erano valide: BADSIG 8F66051A3A258030 Launchpad PPA named mscore-stable for MuseScore Maintainers
W: Errore GPG: http://it.archive.ubuntu.com lucid Release: Le seguenti firme non erano valide: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>