linux可以apt-get update报错,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 instead.

本篇中，我们会了解如何修复这个错误。

修复apt-get update无法添加新的CD-ROM的错误

这个错误的原因是cdrom已经被包含在源之中。要修复这个问题，我们需要将它从软件源中移除。

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