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最近在ubuntu 12.10上执行sudo apt-get update 命令后出现了如下错误：
Ign http://extras.ubuntu.com natty/main TranslationIndex Err http://extras.ubuntu.com natty/main Sources 404 Not Found Err http://extras.ubuntu.com natty/main i386 Packages 404 Not Found Ign http://extras.ubuntu.com natty/main Translation-en_US Err http://security.ubuntu.com natty-security/universe Sources 404 Not Found [IP: 91.189.92.200 80] Err http://security.ubuntu.com natty-security/multiverse Sources 404 Not Found [IP: 91.189.92.200 80] Ign http://extras.ubuntu.com natty/main Translation-en Err http://security.ubuntu.com natty-security/universe i386 Packages 404 Not Found [IP: 91.189.92.200 80] Err http://security.ubuntu.com natty-security/multiverse i386 Packages 404 Not Found [IP: 91.189.92.200 80] Err http://security.ubuntu.com natty-security/main Sources 404 Not Found [IP: 91.189.92.200 80] Err http://security.ubuntu.com natty-security/restricted Sources 404 Not Found [IP: 91.189.92.200 80] Err http://security.ubuntu.com natty-security/main i386 Packages 404 Not Found [IP: 91.189.92.200 80] Err http://security.ubuntu.com natty-security/restricted i386 Packages 404 Not Found [IP: 91.189.92.200 80] Ign http://security.ubuntu.com natty-security/main Translation-en_US Ign http://security.ubuntu.com natty-security/main Translation-en Ign http://security.ubuntu.com natty-security/multiverse Translation-en_US Ign http://security.ubuntu.com natty-security/multiverse Translation-en Ign http://security.ubuntu.com natty-security/restricted Translation-en_US Ign http://security.ubuntu.com natty-security/restricted Translation-en Ign http://security.ubuntu.com natty-security/universe Translation-en_US Ign http://security.ubuntu.com natty-security/universe Translation-en W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/main/source/Sources 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/restricted/source/Sources 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/universe/source/Sources 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/multiverse/source/Sources 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty/multiverse/binary-i386/Packages 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/main/source/Sources 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/restricted/source/Sources 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/universe/source/Sources 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/multiverse/source/Sources 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/main/binary-i386/Packages 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/restricted/binary-i386/Packages 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/universe/binary-i386/Packages 404 Not Found W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/natty-updates/multiverse/binary-i386/Packages 404 Not Found W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/universe/source/Sources 404 Not Found [IP: 91.189.92.200 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/multiverse/source/Sources 404 Not Found [IP: 91.189.92.200 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/universe/binary-i386/Packages 404 Not Found [IP: 91.189.92.200 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/multiverse/binary-i386/Packages 404 Not Found [IP: 91.189.92.200 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/main/source/Sources 404 Not Found [IP: 91.189.92.200 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/restricted/source/Sources 404 Not Found [IP: 91.189.92.200 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/main/binary-i386/Packages 404 Not Found [IP: 91.189.92.200 80] W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/natty-security/restricted/binary-i386/Packages 404 Not Found [IP: 91.189.92.200 80] W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/natty/main/source/Sources 404 Not Found W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. chaihuasong@chaihuasong:~$ sudo apt-get install git Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package git
发现很多源找不到，需要重新寻找更新源，最后把/etc/apt/sources.list文件中的内容直接替换成:
deb http://mirrors.163.com/ubuntu/ lucid main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ lucid-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ lucid-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ lucid-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ lucid-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ lucid main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ lucid-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ lucid-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ lucid-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ lucid-backports main restricted universe multiverse
发现了这个源超级快的，是网易163更新服务器，亲测可用
另外附上
搜狐更新服务器：
deb http://mirrors.sohu.com/ubuntu/ lucid main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ lucid-security main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ lucid-updates main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ lucid-proposed main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ lucid-backports main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ lucid main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ lucid-security main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ lucid-updates main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ lucid-proposed main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ lucid-backports main restricted universe multiverse
这个速度也非常快，国内的源就是牛x啊～～
The solution for apt-get update Err 404
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原文地址：http://www.cnblogs.com/pinxiong/p/4912689.html
