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 11.04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）

#台湾源

deb http://tw.archive.ubuntu.com/ubuntu/ natty main universe restricted multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu/ natty main universe restricted multiverse
deb http://tw.archive.ubuntu.com/ubuntu/ natty-security universe main multiverse restricted
deb-src http://tw.archive.ubuntu.com/ubuntu/ natty-security universe main multiverse restricted
deb http://tw.archive.ubuntu.com/ubuntu/ natty-updates universe main multiverse restricted
deb-src http://tw.archive.ubuntu.com/ubuntu/ natty-updates universe main multiverse restricted

#网易 Ubuntu 11.04 源（速度很快）

deb http://mirrors.163.com/ubuntu/ natty main universe restricted multiverse
deb-src http://mirrors.163.com/ubuntu/ natty main universe restricted multiverse
deb http://mirrors.163.com/ubuntu/ natty-security universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ natty-security universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ natty-updates universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ natty-proposed universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ natty-proposed universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ natty-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ natty-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ natty-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/ natty main universe restricted multiverse
deb-src http://ubuntu.srt.cn/ubuntu/ natty main universe restricted multiverse
deb http://ubuntu.srt.cn/ubuntu/ natty-security universe main multiverse restricted
deb-src http://ubuntu.srt.cn/ubuntu/ natty-security universe main multiverse restricted
deb http://ubuntu.srt.cn/ubuntu/ natty-updates universe main multiverse restricted
deb http://ubuntu.srt.cn/ubuntu/ natty-proposed universe main multiverse restricted
deb-src http://ubuntu.srt.cn/ubuntu/ natty-proposed universe main multiverse restricted
deb http://ubuntu.srt.cn/ubuntu/ natty-backports universe main multiverse restricted
deb-src http://ubuntu.srt.cn/ubuntu/ natty-backports universe main multiverse restricted
deb-src http://ubuntu.srt.cn/ubuntu/ natty-updates universe main multiverse restricted

#大家可以自己根据自己的版本设置一下，不一定局限于ubuntu 11.04，下面列出一些校内更新源。

#电子科技大学

deb http://ubuntu.uestc.edu.cn/ubuntu/ natty main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ natty-backports main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ natty-proposed main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ natty-security main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ natty-updates main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ natty main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ natty-backports main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ natty-proposed main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ natty-security main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ natty-updates main restricted universe multiverse

#中国科技大学

deb http://debian.ustc.edu.cn/ubuntu/ natty main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ natty-backports restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ natty-proposed main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ natty-security main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ natty-updates main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ natty main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ natty-backports main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ natty-proposed main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ natty-security main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ natty-updates main restricted universe multiverse

#北京理工大学

deb http://mirror.bjtu.edu.cn/ubuntu/ natty main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ natty-backports main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ natty-proposed main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ natty-security main multiverse restricted universe
deb http://mirror.bjtu.edu.cn/ubuntu/ natty-updates main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ natty main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ natty-backports main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ natty-proposed main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ natty-security main multiverse restricted universe
deb-src http://mirror.bjtu.edu.cn/ubuntu/ natty-updates main multiverse restricted universe

#兰州大学

deb ftp://mirror.lzu.edu.cn/ubuntu/ natty main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ natty-backports main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ natty-proposed main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ natty-security main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ natty-updates main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu-cn/ natty main multiverse restricted universe

#上海交通大学

deb http://ftp.sjtu.edu.cn/ubuntu/ natty main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu/ natty-backports main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu/ natty-proposed main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu/ natty-security main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu/ natty-updates main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu-cn/ natty main multiverse restricted universe deb-src http://ftp.sjtu.edu.cn/ubuntu/ natty main multiverse restricted universe deb-src http://ftp.sjtu.edu.cn/ubuntu/ natty-backports main multiverse restricted universe deb-src http://ftp.sjtu.edu.cn/ubuntu/ natty-proposed main multiverse restricted universe deb-src http://ftp.sjtu.edu.cn/ubuntu/ natty-security main multiverse restricted universe deb-src http://ftp.sjtu.edu.cn/ubuntu/ natty-updates main multiverse restricted universe