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apt-get update 中的问题 - Ubuntu 12.04？

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apt-get update 中的问题 - Ubuntu 12.04？

可能重复：
由于缺少 CDROM，无法下载存储库信息

如何解决以下错误信息？

错误信息：

W:Failed to fetch cdrom://Ubuntu 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)/dists/precise/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 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)/dists/precise/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 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)/dists/precise/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 12.04.1 LTS _Precise Pangolin_ - Release amd64 (20120823.1)/dists/precise/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, 
E:Some index files failed to download. They have been ignored, or old ones used instead.

答案1

打开更新管理器，进入设置-> ubuntu 软件，取消选中你的 CDROM，然后进入其他软件，取消选中所有 CDROM

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