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我该如何修复这些失败？

tag-icon • tag-icon software-installation
我该如何修复这些失败？ 
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.

答案1

使用以下方式编辑您的 sources.listsudo nano /etc/apt/sources.list

删除安装 CD 所在的行（可能是第一行或第二行，以“deb cdrom: ”开头）以及包含 PPA-URL 的行。如果没有此行，请查看/etc/apt/sources.list.d/并删除包含 gwibber 的 PPA 的文件。

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