源地址：http://www.cnblogs.com/eastson/archive/2012/08/24/2654163.html

1、首先备份Ubuntu12.04源列表

sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup （备份下当前的源列表）

2、修改更新源

sudo gedit /etc/apt/sources.list （打开Ubuntu 12.04源列表文件）

3、把里面的列表替换成下面的列表

163源

按 Ctrl+C 复制代码
按 Ctrl+C 复制代码

sohu源

deb http://mirrors.sohu.com/ubuntu/ precise main restricted

deb-src http://mirrors.sohu.com/ubuntu/ precise main restricted

deb http://mirrors.sohu.com/ubuntu/ precise-updates main restricted

deb-src http://mirrors.sohu.com/ubuntu/ precise-updates main restricted

deb http://mirrors.sohu.com/ubuntu/ precise universe

deb-src http://mirrors.sohu.com/ubuntu/ precise universe

deb http://mirrors.sohu.com/ubuntu/ precise-updates universe

deb-src http://mirrors.sohu.com/ubuntu/ precise-updates universe

deb http://mirrors.sohu.com/ubuntu/ precise multiverse

deb-src http://mirrors.sohu.com/ubuntu/ precise multiverse

deb http://mirrors.sohu.com/ubuntu/ precise-updates multiverse

deb-src http://mirrors.sohu.com/ubuntu/ precise-updates multiverse

deb http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiverse

deb-src http://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe multiverse

deb http://mirrors.sohu.com/ubuntu/ precise-security main restricted

deb-src http://mirrors.sohu.com/ubuntu/ precise-security main restricted

deb http://mirrors.sohu.com/ubuntu/ precise-security universe

deb-src http://mirrors.sohu.com/ubuntu/ precise-security universe

deb http://mirrors.sohu.com/ubuntu/ precise-security multiverse

deb-src http://mirrors.sohu.com/ubuntu/ precise-security multiverse

deb http://extras.ubuntu.com/ubuntu precise main

deb-src http://extras.ubuntu.com/ubuntu precise main

ubuntu.cn99.com源（推荐）:

deb http://ubuntu.cn99.com/ubuntu/ precise main restricted universe multiverse

deb http://ubuntu.cn99.com/ubuntu/ precise-updates main restricted universe multiverse

deb http://ubuntu.cn99.com/ubuntu/ precise-security main restricted universe multiverse

deb http://ubuntu.cn99.com/ubuntu/ precise-backports main restricted universe multiverse

deb http://ubuntu.cn99.com/ubuntu-cn/ precise main restricted universe multiverse

教育网源
如果你是在校大学生，可以使用校园网/教育网，就是用教育网的资源吧，尤其是支持ipv6的，那更新速度就按兆算了。

#电子科技大学

deb http://ubuntu.uestc.edu.cn/ubuntu/ precise main restricted universe multiverse

deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse

deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse

deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiverse

deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse

deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise main restricted universe multiverse

deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse

deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse

deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiverse

deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse

#中国科技大学

deb http://debian.ustc.edu.cn/ubuntu/ precise main restricted universe multiverse

deb http://debian.ustc.edu.cn/ubuntu/ precise-backports restricted universe multiverse

deb http://debian.ustc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse

deb http://debian.ustc.edu.cn/ubuntu/ precise-security main restricted universe multiverse

deb http://debian.ustc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse

deb-src http://debian.ustc.edu.cn/ubuntu/ precise main restricted universe multiverse

deb-src http://debian.ustc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse

deb-src http://debian.ustc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse

deb-src http://debian.ustc.edu.cn/ubuntu/ precise-security main restricted universe multiverse

deb-src http://debian.ustc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse

#北京理工大学

deb http://mirror.bjtu.edu.cn/ubuntu/ precise main multiverse restricted universe

deb http://mirror.bjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe

deb http://mirror.bjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe

deb http://mirror.bjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe

deb http://mirror.bjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe

deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise main multiverse restricted universe

deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe

deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe

deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe

deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe

4、更新源

sudo apt-get update

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