ubuntu更新源修改更新源

sudo gedit /etc/apt/sources.list
Ubuntu.cn99.com 更新服务器(推荐广东电信用户使用。）：江苏省常州市电信:)
deb http://ubuntu.cn99.com/ubuntu/ feisty main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ feisty-security main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ feisty-updates main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ feisty-proposed main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ feisty-backports main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty-security main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty-updates main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty-proposed main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ feisty-backports main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu-cn/ feisty main restricted universe multiverse

也可以用以下资源：
Archive.ubuntu.com更新服务器（欧洲，此为官方源，推荐使用)：

deb http://archive.ubuntu.com/ubuntu/ feisty main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ feisty-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ feisty-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ feisty-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ feisty-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ feisty main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ feisty-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ feisty-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ feisty-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ feisty-backports main restricted universe multiverse

Mirror.lupaworld.com更新服务器（浙江省杭州市双线服务器，亚洲地区官方更新服务器）：

deb http://cn.archive.ubuntu.com/ubuntu feisty main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu feisty-security main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu feisty-updates main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu feisty-backports main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu feisty-proposed main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu feisty main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu feisty-security main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu feisty-updates main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu feisty-backports main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu feisty-proposed main restricted universe multiverse

成都市中国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/ feisty main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ feisty-backports main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ feisty-proposed main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ feisty-security main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ feisty-updates main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ feisty main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ feisty-backports main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ feisty-proposed main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ feisty-security main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ feisty-updates main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu-cn/ feisty 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/ feisty main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ feisty-backports main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ feisty-proposed main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ feisty-security main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ feisty-updates main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ feisty main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ feisty-backports main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ feisty-proposed main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ feisty-security main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ feisty-updates main multiverse restricted universe


北京市清华大学更新服务器（教育网，推荐校园网和网通用户使用）：

deb http://mirror9.net9.org/ubuntu/ feisty main multiverse restricted universe
deb http://mirror9.net9.org/ubuntu/ feisty-backports main multiverse restricted universe
deb http://mirror9.net9.org/ubuntu/ feisty-proposed main multiverse restricted universe
deb http://mirror9.net9.org/ubuntu/ feisty-security main multiverse restricted universe
deb http://mirror9.net9.org/ubuntu/ feisty-updates main multiverse restricted universe
deb-src http://mirror9.net9.org/ubuntu/ feisty main multiverse restricted universe
deb-src http://mirror9.net9.org/ubuntu/ feisty-backports main multiverse restricted universe
deb-src http://mirror9.net9.org/ubuntu/ feisty-proposed main multiverse restricted universe
deb-src http://mirror9.net9.org/ubuntu/ feisty-security main multiverse restricted universe
deb-src http://mirror9.net9.org/ubuntu/ feisty-updates main multiverse restricted universe


沈阳市东北大学更新服务器（教育网，推荐校园网和网通用户使用）：

deb ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ feisty main multiverse restricted universe
deb ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ feisty-backports main multiverse restricted universe
deb ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ feisty-proposed main multiverse restricted universe
deb ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ feisty-security main multiverse restricted universe
deb ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ feisty-updates main multiverse restricted universe
deb-src ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ feisty main multiverse restricted universe
deb-src ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ feisty-backports main multiverse restricted universe
deb-src ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ feisty-proposed main multiverse restricted universe
deb-src ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ feisty-security main multiverse restricted universe
deb-src ftp://ftp.neu.edu.cn/mirror/archive.ubuntu.com/ubuntu/ feisty-updates main multiverse restricted universe


中国台湾省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/ feisty main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ feisty main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ feisty-updates main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ feisty-updates main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ feisty-backports main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ feisty-backports main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ feisty-security main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ feisty-security main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ feisty-proposed main multiverse restricted universe
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ feisty-proposed main restricted universe multiverse

ubuntu.cnsite.org更新服务器（福建省福州市 电信）：

deb http://ubuntu.cnsite.org/ubuntu/ feisty main restricted universe multiverse
deb-src http://ubuntu.cnsite.org/ubuntu/ feisty main restricted universe multiverse
deb http://ubuntu.cnsite.org/ubuntu/ feisty-updates main restricted universe multiverse
deb-src http://ubuntu.cnsite.org/ubuntu/ feisty-updates main restricted universe multiverse
deb http://ubuntu.cnsite.org/ubuntu/ feisty-backports main restricted universe multiverse
deb-src http://ubuntu.cnsite.org/ubuntu/ feisty-backports main restricted universe multiverse
deb http://ubuntu.cnsite.org/ubuntu/ feisty-security main restricted universe multiverse
deb-src http://ubuntu.cnsite.org/ubuntu/ feisty-security main restricted universe multiverse
deb http://ubuntu.cnsite.org/ubuntu/ feisty-proposed main multiverse restricted universe
deb-src http://ubuntu.cnsite.org/ubuntu/ feisty-proposed main restricted universe multiverse


mirror.rootguide.org更新服务器（上海市 电信）：

deb http://mirror.rootguide.org/ubuntu/ feisty main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ feisty main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ feisty-updates main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ feisty-updates main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ feisty-backports main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ feisty-backports main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ feisty-security main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ feisty-security main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ feisty-proposed main multiverse restricted universe
deb-src http://mirror.rootguide.org/ubuntu/ feisty-proposed main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu-cn/ feisty 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 feisty main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu feisty-security main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu feisty-updates main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu feisty-backports main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu feisty-proposed main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu feisty main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu feisty-security main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu feisty-updates main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu feisty-backports main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu feisty-proposed main restricted universe multiverse