ubuntu系统与网络关系密切，往往在完成系统安装之后需要进行必需软件的安装及更新。方法网上都可以找得到，这里再重述一下。
首先，使用su root切换至超级用户权限；
然后，gedit /etc/apt/sources.list，打开源列表文件，这里没有进行备份，如果需要，也可以用cp命令进行下备份；
将以下所示的源列表之一全部复制到sources.list文件中，替换原有内容；
最后，保存并关闭已经打开的source.list文件，在终端输入 apt-get update命令。
以上三步即完成源列表的更新。
#台湾源
- deb http://tw.archive.ubuntu.com/ubuntu/
precise main universe restricted multiverse
- deb-src http://tw.archive.ubuntu.com/ubuntu/
precise main universe restricted multiverse
- deb http://tw.archive.ubuntu.com/ubuntu/
precise-security universe main
multiverse restricted
- deb-src http://tw.archive.ubuntu.com/ubuntu/
precise-security universe main
multiverse restricted
- deb http://tw.archive.ubuntu.com/ubuntu/
precise-updates universe main
multiverse restricted
- deb-src http://tw.archive.ubuntu.com/ubuntu/
precise-updates universe main
multiverse restricted
#网易 Ubuntu 源（速度很快）
- deb http://mirrors.163.com/ubuntu/
precise main universe restricted multiverse
- deb-src http://mirrors.163.com/ubuntu/
precise main universe restricted multiverse
- deb http://mirrors.163.com/ubuntu/
precise-security universe main
multiverse restricted
- deb-src http://mirrors.163.com/ubuntu/
precise-security universe main
multiverse restricted
- deb http://mirrors.163.com/ubuntu/
precise-updates universe main
multiverse restricted
- deb http://mirrors.163.com/ubuntu/
precise-proposed universe main
multiverse restricted
- deb-src http://mirrors.163.com/ubuntu/
precise-proposed universe main
multiverse restricted
- deb http://mirrors.163.com/ubuntu/
precise-backports universe main
multiverse restricted
- deb-src http://mirrors.163.com/ubuntu/
precise-backports universe main
multiverse restricted
- deb-src http://mirrors.163.com/ubuntu/
precise-updates universe main
multiverse restricted
#骨头源，骨头源是bones7456架设的一个Ubuntu源
，提供ubuntu,deepin
- deb http://ubuntu.srt.cn/ubuntu/
precise main universe restricted multiverse
- deb-src http://ubuntu.srt.cn/ubuntu/
precise main universe restricted multiverse
- deb http://ubuntu.srt.cn/ubuntu/
precise-security universe main
multiverse restricted
- deb-src http://ubuntu.srt.cn/ubuntu/
precise-security universe main
multiverse restricted
- deb http://ubuntu.srt.cn/ubuntu/
precise-updates universe main
multiverse restricted
- deb http://ubuntu.srt.cn/ubuntu/
precise-proposed universe main
multiverse restricted
- deb-src http://ubuntu.srt.cn/ubuntu/
precise-proposed universe main
multiverse restricted
- deb http://ubuntu.srt.cn/ubuntu/
precise-backports universe main
multiverse restricted
- deb-src http://ubuntu.srt.cn/ubuntu/
precise-backports universe main
multiverse restricted
- deb-src http://ubuntu.srt.cn/ubuntu/
precise-updates universe main
multiverse restricted
#mirror.lupaworld.com的源，速度很快
- deb http://mirror.lupaworld.com/ubuntu/archive/ precise main restricted universe
multiverse
- deb http://mirror.lupaworld.com/ubuntu/archive/ precise-security
main restricted universe multiverse
- deb http://mirror.lupaworld.com/ubuntu/archive/ precise-updates
main restricted universe multiverse
- deb http://mirror.lupaworld.com/ubuntu/archive/ precise-backports
main restricted universe multiverse
- deb http://mirror.lupaworld.com/ubuntu/ubuntu-cn/ precise main restricted universe
multiverse
#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
#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
#兰州大学
- deb ftp://mirror.lzu.edu.cn/ubuntu/
precise main multiverse restricted universe
- deb ftp://mirror.lzu.edu.cn/ubuntu/
precise-backports main multiverse
restricted universe
- deb ftp://mirror.lzu.edu.cn/ubuntu/
precise-proposed main multiverse
restricted universe
- deb ftp://mirror.lzu.edu.cn/ubuntu/
precise-security main multiverse
restricted universe
- deb ftp://mirror.lzu.edu.cn/ubuntu/
precise-updates main multiverse
restricted universe
- deb ftp://mirror.lzu.edu.cn/ubuntu-cn/ precise main multiverse restricted
universe
#上海交通大学
- deb http://ftp.sjtu.edu.cn/ubuntu/
precise main multiverse restricted universe
- deb http://ftp.sjtu.edu.cn/ubuntu/
precise-backports main multiverse
restricted universe
- deb http://ftp.sjtu.edu.cn/ubuntu/
precise-proposed main multiverse
restricted universe
- deb http://ftp.sjtu.edu.cn/ubuntu/
precise-security main multiverse
restricted universe
- deb http://ftp.sjtu.edu.cn/ubuntu/
precise-updates main multiverse
restricted universe
- deb http://ftp.sjtu.edu.cn/ubuntu-cn/ precise main multiverse restricted
universe
- deb-src http://ftp.sjtu.edu.cn/ubuntu/
precise main multiverse restricted universe
- deb-src http://ftp.sjtu.edu.cn/ubuntu/
precise-backports main multiverse
restricted universe
- deb-src http://ftp.sjtu.edu.cn/ubuntu/
precise-proposed main multiverse
restricted universe
- deb-src http://ftp.sjtu.edu.cn/ubuntu/
precise-security main multiverse
restricted universe
- deb-src http://ftp.sjtu.edu.cn/ubuntu/
precise-updates main multiverse
restricted universe
ubuntu12.04更新源,布布扣,bubuko.com
ubuntu12.04更新源
原文：http://www.cnblogs.com/Orc-SQ/p/3597629.html
