W: Failed to fetch cdrom://Ubuntu-Studio 12.10 _Quantal Quetzal_ - Release amd64 (20121017.1)/dists/quantal/main/binary-amd64/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-Studio 12.10 _Quantal Quetzal_ - Release amd64 (20121017.1)/dists/quantal/multiverse/binary-amd64/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-Studio 12.10 _Quantal Quetzal_ - Release amd64 (20121017.1)/dists/quantal/restricted/binary-amd64/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-Studio 12.10 _Quantal Quetzal_ - Release amd64 (20121017.1)/dists/quantal/universe/binary-amd64/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-Studio 12.10 _Quantal Quetzal_ - Release amd64 (20121017.1)/dists/quantal/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-Studio 12.10 _Quantal Quetzal_ - Release amd64 (20121017.1)/dists/quantal/multiverse/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-Studio 12.10 _Quantal Quetzal_ - Release amd64 (20121017.1)/dists/quantal/restricted/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-Studio 12.10 _Quantal Quetzal_ - Release amd64 (20121017.1)/dists/quantal/universe/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 http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu/dists/quantal/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu/dists/quantal/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
答え1
ソースリストを編集しますsudo nano /etc/apt/sources.list
インストール CD の行 (おそらく 1 行目または 2 行目で、「deb cdrom:」で始まる行) と、その中にある PPA-URL の行を削除します。この行がない場合は、/etc/apt/sources.list.d/gwibber の PPA を含むファイルを確認して削除します。