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更新时出现问题

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更新时出现问题 
Failed to fetch cdrom://Ubuntu 14.04 LTS _Trusty Tahr_ - Release amd64 (20140417)/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://Ubuntu 14.04 LTS _Trusty Tahr_ - Release amd64 (20140417)/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

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/Release.gpg  Connection failed

E: Some index files failed to download. They have been ignored, or old ones used instead.

答案1

转到软件中心，编辑菜单、源并在第一个选项卡中禁用所有 CD/DVD。

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