报错内容示例
W: Failed to fetch http://us.old-releases.ubuntu.com/ubuntu/dists/precise-updates/Release.gpg Something wicked happened resolving ‘us.old-releases.ubuntu.com:http’ (-5 - No address associated with hostname)
…
Ign http://extras.ubuntu.com precise/main TranslationIndex
…
Err http://security.ubuntu.com precise-security/universe i386 Packages
404 Not Found [IP: 185.125.190.36 80]
…
E: Some index files failed to download. They have been ignored, or old ones used instead.
解决方法
主要参考博客:
Ubuntu 解决:当执行sudo apt-get update命令时 出现的 “404 Not Found” 问题
注意:在添加代码时也要删除或用#注释掉/etc/apt/sources.list中原来的所有的deb或deb-src开头的内容:sudo gedit /etc/apt/sources.list
示例图片:


红色方框内的都要注释或删除掉
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