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[ubuntu] Failed to download repository information

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http://ubuntuforums.org – W:GPG error: http://repository.spotify.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 082CCEDF94558F59, W:Failed to fetch cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release i386 (20111012)/dists/oneiric/main/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs , W:Failed to fetch cdrom://Ubuntu 11.10 _Oneiric Ocelot_ - Release i386 (20111012)/dists/oneiric/restricted/binary-i386/Packages Please use apt-cdrom to make this CD-ROM recognized by APT. (Hardware)