ubuntu12.04高速更新源

163源

deb http://mirrors.163.com/ubuntu/ precise main restricted
 deb-src http://mirrors.163.com/ubuntu/ precise main restricted
 deb http://mirrors.163.com/ubuntu/ precise-updates main restricted
 deb-src http://mirrors.163.com/ubuntu/ precise-updates main restricted
 deb http://mirrors.163.com/ubuntu/ precise universe
 deb-src http://mirrors.163.com/ubuntu/ precise universe
 deb http://mirrors.163.com/ubuntu/ precise-updates universe
 deb-src http://mirrors.163.com/ubuntu/ precise-updates universe
 deb http://mirrors.163.com/ubuntu/ precise multiverse
 deb-src http://mirrors.163.com/ubuntu/ precise multiverse
 deb http://mirrors.163.com/ubuntu/ precise-updates multiverse
 deb-src http://mirrors.163.com/ubuntu/ precise-updates multiverse
 deb http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiverse
 deb-src http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiverse
 deb http://mirrors.163.com/ubuntu/ precise-security main restricted
 deb-src http://mirrors.163.com/ubuntu/ precise-security main restricted
 deb http://mirrors.163.com/ubuntu/ precise-security universe
 deb-src http://mirrors.163.com/ubuntu/ precise-security universe
 deb http://mirrors.163.com/ubuntu/ precise-security multiverse
 deb-src http://mirrors.163.com/ubuntu/ precise-security multiverse
 deb http://extras.ubuntu.com/ubuntu precise main
 deb-src http://extras.ubuntu.com/ubuntu precise main

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

使用方式：

sudo gedit /etc/apt/sources.list

然后把里面的列表替换成上面的列表，保存退出即可，修改完之后最好刷新一下系统的源：

sudo apt-get update