![更新时出错](https://linux22.com/image/1135484/%E6%9B%B4%E6%96%B0%E6%97%B6%E5%87%BA%E9%94%99.png)
我是一名运行 14.04 LTS 的 Ubuntu 新用户,有一个问题已经困扰我两天了。
这是我使用 $ sudo apt-get update 时收到的错误:
W:Failed to fetch cdrom://Ubuntu 14.04.4 LTS _Trusty Tahr_ - Release i386 (20160217.1)/buntu/dists/trusty/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 http://archive.ubuntu.com/ubuntu/dists/trusty/Release Unable to find expected entry 'restricted/source/Sources' in Release file (Wrong sources.list entry or malformed file)
我通过 USB 启动了操作系统,但没有可启动光盘。这导致其他错误,使我无法通过软件中心下载/安装任何新应用程序。
请帮助新手并提前致谢!