1.sudo gedit /etc/apt/sources.list
编辑你的源列表，加入以下列表中你认为适合你的，拷贝到你的列表中，然后保存列表。
Archive.ubuntu.com更新server（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
成都市 电子科技大学更新server（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
== 假设无法解析uestc.edu.cn域名，请使用下面地址 ==
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server（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server（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Tai w Tai w大学更新server（推荐网通用户使用，电信PING平均响应速度41MS。强烈推荐此源，比較完整，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.lupaworld.com更新server（浙江省杭州市双线server，推荐）：
引用
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
中科大ubuntu 更新server（安徽省合肥市，推荐教育网,网通用户使用）：
deb http://debian.ustc.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-backports main restricted universe multiverse
上海交通大学FTP ubuntu 更新server（推荐教育网用户使用）：
deb ftp://ftp.sjtu.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb ftp://ftp.sjtu.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb ftp://ftp.sjtu.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb ftp://ftp.sjtu.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb ftp://ftp.sjtu.edu.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src ftp://ftp.sjtu.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb-src ftp://ftp.sjtu.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb-src ftp://ftp.sjtu.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src ftp://ftp.sjtu.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src ftp://ftp.sjtu.edu.cn/ubuntu/ jaunty-backports main restricted universe multiverse
新加坡国立大学理学院 ubuntu 更新源(全部用户通用）：
deb http://ftp.science.nus.edu.sg/ubuntu/ jaunty main restricted universe multiverse
deb http://ftp.science.nus.edu.sg/ubuntu/ jaunty-security main restricted universe multiverse
deb http://ftp.science.nus.edu.sg/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://ftp.science.nus.edu.sg/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://ftp.science.nus.edu.sg/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://ftp.science.nus.edu.sg/ubuntu/ jaunty main restricted universe multiverse
deb-src http://ftp.science.nus.edu.sg/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://ftp.science.nus.edu.sg/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://ftp.science.nus.edu.sg/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://ftp.science.nus.edu.sg/ubuntu/ jaunty-backports main restricted universe multiverse
上海Linux 爱好者协会 更新server：
deb http://mirrors.shlug.org/ubuntu/ jaunty main restricted universe multiverse
deb http://mirrors.shlug.org/ubuntu/ jaunty-security main restricted universe multiverse
deb http://mirrors.shlug.org/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://mirrors.shlug.org/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://mirrors.shlug.org/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://mirrors.shlug.org/ubuntu/ jaunty main restricted universe multiverse
deb-src http://mirrors.shlug.org/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://mirrors.shlug.org/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://mirrors.shlug.org/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://mirrors.shlug.org/ubuntu/ jaunty-backports main restricted universe multiverse
来自日本的ubuntu 更新server （全国用户通用）：
deb http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ jaunty main restricted universe multiverse
deb http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ jaunty-security main restricted universe multiverse
deb http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ jaunty main restricted universe multiverse
deb-src http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://ftp.jaist.ac.jp/pub/Linux/ubuntu/ jaunty-backports main restricted universe multiverse
来自澳大利亚 optus.net 的ubuntu 更新server （全国通用，经測试速度挺快）：
deb http://mirror.optus.net/ubuntu/ jaunty main restricted universe multiverse
deb http://mirror.optus.net/ubuntu/ jaunty-security main restricted universe multiverse
deb http://mirror.optus.net/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://mirror.optus.net/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://mirror.optus.net/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://mirror.optus.net/ubuntu/ jaunty main restricted universe multiverse
deb-src http://mirror.optus.net/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://mirror.optus.net/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://mirror.optus.net/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://mirror.optus.net/ubuntu/ jaunty-backports main restricted universe multiverse
来自北方的蒙古国的更新源 （速度还算能够，推荐北方用户使用）：
deb http://archive.ubuntu.mnosi.org/ubuntu/ jaunty main restricted universe multiverse
deb http://archive.ubuntu.mnosi.org/ubuntu/ jaunty-security main restricted universe multiverse
deb http://archive.ubuntu.mnosi.org/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://archive.ubuntu.mnosi.org/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://archive.ubuntu.mnosi.org/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://archive.ubuntu.mnosi.org/ubuntu/ jaunty main restricted universe multiverse
deb-src http://archive.ubuntu.mnosi.org/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://archive.ubuntu.mnosi.org/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://archive.ubuntu.mnosi.org/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.mnosi.org/ubuntu/ jaunty-backports main restricted universe multiverse
来自台湾的国立交通大学的更新源：
deb http://debian.nctu.edu.tw/ubuntu/ jaunty main restricted universe multiverse
deb http://debian.nctu.edu.tw/ubuntu/ jaunty-security main restricted universe multiverse
deb http://debian.nctu.edu.tw/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://debian.nctu.edu.tw/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://debian.nctu.edu.tw/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://debian.nctu.edu.tw/ubuntu/ jaunty main restricted universe multiverse
deb-src http://debian.nctu.edu.tw/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://debian.nctu.edu.tw/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://debian.nctu.edu.tw/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://debian.nctu.edu.tw/ubuntu/ jaunty-backports main restricted universe multiverse
来自lupaworld.com 更新源 （推荐网通用户使用):
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-proposed main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/ jaunty-backports 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-proposed main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu/ jaunty-backports main restricted universe multiverse
acc.umu.se更新server（来自以色列，全国用户通用）：
deb http://ftp.acc.umu.se/mirror/ubuntu/ jaunty main restricted universe multiverse
deb http://ftp.acc.umu.se/mirror/ubuntu/ jaunty-security main restricted universe multiverse
deb http://ftp.acc.umu.se/mirror/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://ftp.acc.umu.se/mirror/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://ftp.acc.umu.se/mirror/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://ftp.acc.umu.se/mirror/ubuntu/ jaunty main restricted universe multiverse
deb-src http://ftp.acc.umu.se/mirror/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://ftp.acc.umu.se/mirror/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://ftp.acc.umu.se/mirror/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://ftp.acc.umu.se/mirror/ubuntu/ jaunty-backports main restricted universe multiverse
cn99cn99.com更新server（江苏省常州市电信，推荐电信用户使用）：
deb http://ubuntu.cn99.com/ubuntu/ jaunty main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ jaunty-security main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ jaunty main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ jaunty-backports main restricted universe multiverse
2.sudo apt-get update 更新源列表信息
请至少保存官方更新源。