pop：更新源之前，建议在终端下面先ping一下更新服务器的域名，看速度如何，根据自己的网络线路进行选择
单击主菜单中的“应用程序 - 附件 - 终端”。修改更新服务器列表。请在终端中执行下面的两条命令：
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
sudo gedit /etc/apt/sources.list
注意:接下来在打开的文本编辑器中，把你看到的内容全部删掉，粘贴下面的源地址，然后保存即可。
Ubuntu 9.04源地址列表：
Archive.ubuntu.com更新服务器（欧洲，此为官方源，电信网通用户使用)：
deb http://archive.ubuntu.com/ubuntu/ jaunty main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jaunty-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty-backports main restricted universe multiverse
网易163更新服务器：
deb http://mirrors.163.com/ubuntu/ jaunty main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ jaunty-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty-backports main restricted universe multiverse
Mirrors.shlug.org更新服务器（电信服务器，Ubuntu China Official Mirror, maintained by Shanghai Linux User Group）：
deb http://cn.archive.ubuntu.com/ubuntu jaunty main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu jaunty-security main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu jaunty-updates main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu jaunty-backports main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu jaunty-proposed main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu jaunty main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu jaunty-security main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu jaunty-updates main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu jaunty-backports main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu jaunty-proposed main restricted universe multiverse
Mirror.lupaworld.com更新服务器（浙江省杭州市双线服务器，推荐）：
deb http://mirror.lupaworld.com/ubuntu jaunty main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu jaunty-security main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu jaunty-updates main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu jaunty-backports main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu jaunty-proposed main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu jaunty main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu jaunty-security main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu jaunty-updates main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu jaunty-backports main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu jaunty-proposed main restricted universe multiverse
厦门大学更新服务器（教育网服务器）：
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty-backports restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty-updates main restricted universe multiverse
成都市 电子科技大学更新服务器（教育网，推荐校园网和网通用户使用）：
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
== 如果无法解析uestc.edu.cn域名，请使用以下地址 ==
deb http://ubuntu.dormforce.net/ubuntu/ jaunty main multiverse restricted universe
deb http://ubuntu.dormforce.net/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://ubuntu.dormforce.net/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://ubuntu.dormforce.net/ubuntu/ jaunty-security main multiverse restricted universe
deb http://ubuntu.dormforce.net/ubuntu/ jaunty-updates main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ jaunty main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ jaunty-security main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ jaunty-updates main multiverse restricted universe
上海市上海交通大学更新服务器（教育网，推荐校园网和网通用户使用）：
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe中国科学技术大学更新服务器（教育网，推荐校园网和网通用户使用）：
deb http://debian.ustc.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
中国台湾 台湾大学更新服务器（推荐网通用户使用，电信PING平均响应速度41MS。强烈推荐此源，比较完整，较少出现同步问题）：
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-backports main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-security main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-proposed main restricted universe multiverse
mirror.rootguide.org更新服务器（上海市 电信）：
deb http://mirror.rootguide.org/ubuntu/ jaunty main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ jaunty main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ jaunty-backports main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ jaunty-security main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://mirror.rootguide.org/ubuntu/ jaunty-proposed main restricted universe multiverse
台湾的官方源速度也相当不错，有时甚至快于内地的：
deb http://tw.archive.ubuntu.com/ubuntu jaunty main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu jaunty-security main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu jaunty-updates main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu jaunty-backports main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu jaunty-proposed main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu jaunty main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu jaunty-security main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu jaunty-updates main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu jaunty-backports main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu jaunty-proposed main restricted universe multiverse
以下源支持IPV6,推荐可以使用IPV6的教育网用户使用，速度在200kb/s左右，如需源代码，将deb替换成deb-src即可
deb http://mirror.switch.ch/ftp/ubuntu/ jaunty main multiverse restricted universe
deb http://mirror.switch.ch/ftp/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://mirror.switch.ch/ftp/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://mirror.switch.ch/ftp/ubuntu/ jaunty-security main multiverse restricted universe
deb http://mirror.switch.ch/ftp/ubuntu/ jaunty-updates main multiverse restricted universe
deb http://ftp.heanet.ie/mirrors/ubuntu/ jaunty main multiverse restricted universe
deb http://ftp.heanet.ie/mirrors/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://ftp.heanet.ie/mirrors/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://ftp.heanet.ie/mirrors/ubuntu/ jaunty-security main multiverse restricted universe
deb http://ftp.heanet.ie/mirrors/ubuntu/ jaunty-updates main multiverse restricted universe
deb http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ jaunty main multiverse restricted universe
deb http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ jaunty-backports main multiverse restricted universe
deb http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ jaunty-proposed main multiverse restricted universe
deb http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ jaunty-security main multiverse restricted universe
deb http://ftp.kddlabs.co.jp/020/Linux/packages/ubuntu/archive/ jaunty-updates main multiverse restricted universe
原文地址:
http://wiki.ubuntu.org.cn/%E6%B7%BB%E5%8A%A0%E5%85%B6%E4%BB%96%E8%BD%AF%E4%BB%B6%E5%BA%93