linux添加cdrom源,如何修复 apt-get update 无法添加新的 CD-ROM 的错误

这些天我正在体验Elementary OS Freya，在这期间，我遇到了一个非常常见的更新错误：Failed to fetch cdrom Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs。完整的错误在运行apt-get update后看上去像这样：

W: Failed to fetch cdrom://elementary OS 0.3 Freya – Daily amd64 (20150208)/dists/trusty/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://elementary OS 0.3 Freya – Daily amd64 (20150208)/dists/trusty/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 inst

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