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73 lines
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如何修复 apt-get update 无法添加新的 CD-ROM 的错误
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![](http://itsfoss.itsfoss.netdna-cdn.com/wp-content/uploads/2014/12/elementary_OS_Freya.jpg)
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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:
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> 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
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>
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> 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
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>
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> E: Some index files failed to download. They have been ignored, or old ones used instead.
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本篇中,我们会了解如何修复这个错误。
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### 修复apt-get update无法添加新的CD-ROM的错误 ###
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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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在Ubuntu中,找到“软件与更新”:
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![](http://itsfoss.itsfoss.netdna-cdn.com/wp-content/uploads/2014/08/Software_Update_Ubuntu.jpeg)
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在Ubuntu Software的第一个标签中,找到cdrom,如果它是勾选的,那么取消勾选。
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![](http://itsfoss.itsfoss.netdna-cdn.com/wp-content/uploads/2015/02/CDROM_Error_Update_Software_Sources.jpeg)
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关闭软件源并再次运行更新。现在应该可以用了。
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### 进一步故障排除: ###
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上面描述的方法已经修复了这个**apt-get update cannot be used to add new CD-ROMs**错误。但是这个方法对我无效,因为cdrom的选项这时是灰色的,因为我使用的live版本。
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![](http://itsfoss.itsfoss.netdna-cdn.com/wp-content/uploads/2015/02/CDROM_Update_Error.png)
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现在要修复我们的问题了,我们是要采用命令行路线。打开终端并查看软件源中包含了哪些源:
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cat /etc/apt/sources.list
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我的输出是下面这样:
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deb cdrom:[elementary OS 0.3 _Freya_ – Daily amd64 (20150208)]/ trusty main restricted
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deb http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse
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deb-src http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse
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deb http://security.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
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deb-src http://security.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse
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deb http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse
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deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse
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在上面的第一行中。它包含了cdrom。我们需要用‘#’来注释掉这行:
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#deb cdrom:[elementary OS 0.3 _Freya_ – Daily amd64 (20150208)]/ trusty main restricted
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要用下面的命令来:
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sudo gedit /etc/apt/sources.list
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在你编辑完软件源后,再次运行apt-get update。“apt-get update cannot be used to add new CD-ROMs”这个错误应该已经修复了。如果你还遇到其他的问题,看一下这篇收集了大部分[Ubuntu常见更新错误修复][1]的文章。
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我希望这篇教程对你有用。如果你还有其他的问题和建议,请在下面留言。
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--------------------------------------------------------------------------------
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via: http://itsfoss.com/fix-failed-fetch-cdrom-aptget-update-add-cdroms/
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作者:[Abhishek][a]
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译者:[geekpi](https://github.com/geekpi)
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校对:[wxy](https://github.com/wxy)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译,[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://itsfoss.com/author/abhishek/
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[1]:http://itsfoss.com/fix-update-errors-ubuntu-1404/
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