Ubuntu12.04 更新源
1、首先备份Ubuntu 12.04源列表
sudo
cp /etc/apt/sources.list /etc/apt/sources.list.backup
（备份下当前的源列表，有备无患嘛）
2、修改更新源
sudo
gedit /etc/apt/sources.list （打开Ubuntu
12.04源列表文件）
3、将下面的代码粘贴进去（“#”开头的那一行为注释，可以直接复制进文件中）
4、通知ubuntu启用新的更新源
sudo
apt-get update
#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
12.04 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