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как я могу исправить эти ошибки?

tag-icon • tag-icon software-installation
как я могу исправить эти ошибки? 
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.

решение1

Отредактируйте свой sources.list с помощьюsudo nano /etc/apt/sources.list

Удалите строку с установочным CD (вероятно, первую или вторую строку, которая начинается с "deb cdrom:") и строку с PPA-URL в ней. Если этой строки нет, посмотрите /etc/apt/sources.list.d/и удалите файлы с PPA gwibber.

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