在终端输入命令（应用程序》附件》终端）
ubuntu9.04的换源请到http://ourys.com/post/58.html
备份软件源:
sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
很多人都会说这一步很多余，但是一旦你的软件源出了问题恢复一下不是更容易吗？笔者也遇到过几次有人问我想恢复到默认时候的源怎么办？其实在 Linux 中很多设置都是修改配置文件来进行的，让初学者从开始接触 Linux 就学习备份设置不是一样很好的事吗？建议 Linux 初学者养成操作前先备份的习惯。
编辑软件源:
sudo gedit /etc/apt/sources.list
建议将里面的所有源都删掉，速度太慢了，然后添加相应版本的软件源
然后在系统》系统管理》更新管理器》点击检查，就把网上软件的信息存在你电脑里面，装软件只要输入命令就可以了。
下面是8.10的软件源：
＃Archive.ubuntu.com更新服务器（欧洲，此为官方源，电信网通用户使用，毕竟是国外的，速度慢，最好不要用)：
deb http://archive.ubuntu.com/ubuntu/ intrepid main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ intrepid-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ intrepid-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ intrepid-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ intrepid-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ intrepid main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ intrepid-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ intrepid-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ intrepid-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ intrepid-backports main restricted universe multiverse
＃Ubuntu.cn99.com更新服务器（江苏省常州市电信，推荐电信用户使用）：
deb http://ubuntu.cn99.com/ubuntu/ intrepid main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ intrepid-security main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ intrepid-updates main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ intrepid-proposed main restricted universe multiverse
deb http://ubuntu.cn99.com/ubuntu/ intrepid-backports main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ intrepid main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ intrepid-security main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ intrepid-updates main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ intrepid-proposed main restricted universe multiverse
deb-src http://ubuntu.cn99.com/ubuntu/ intrepid-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 intrepid main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu intrepid-security main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu intrepid-updates main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu intrepid-backports main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu intrepid-proposed main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu intrepid main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu intrepid-security main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu intrepid-updates main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu intrepid-backports main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu intrepid-proposed main restricted universe multiverse
＃Mirror.lupaworld.com更新服务器（浙江省杭州市双线服务器）：
deb http://mirror.lupaworld.com/ubuntu intrepid main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu intrepid-security main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu intrepid-updates main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu intrepid-backports main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu intrepid-proposed main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu intrepid main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu intrepid-security main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu intrepid-updates main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu intrepid-backports main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu intrepid-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/ intrepid main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ intrepid-backports restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ intrepid-proposed main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ intrepid-security main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ intrepid-updates main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ intrepid main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ intrepid-backports main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ intrepid-proposed main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ intrepid-security main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ intrepid-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/ intrepid main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-backports main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-proposed main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-security main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-updates main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ intrepid main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-backports main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-proposed main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-security main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-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/ intrepid main multiverse restricted universe
deb http://ubuntu.dormforce.net/ubuntu/ intrepid-backports main multiverse restricted universe
deb http://ubuntu.dormforce.net/ubuntu/ intrepid-proposed main multiverse restricted universe
deb http://ubuntu.dormforce.net/ubuntu/ intrepid-security main multiverse restricted universe
deb http://ubuntu.dormforce.net/ubunt
u/ intrepid-updates main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ intrepid main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ intrepid-backports main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ intrepid-proposed main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ intrepid-security main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ intrepid-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/ intrepid main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ intrepid-backports main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ intrepid-proposed main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ intrepid-security main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ intrepid-updates main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ intrepid main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ intrepid-backports main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ intrepid-proposed main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ intrepid-security main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ intrepid-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/ intrepid main multiverse restricted universe
deb http://debian.ustc.edu.cn/ubuntu/ intrepid-backports main multiverse restricted universe
deb http://debian.ustc.edu.cn/ubuntu/ intrepid-proposed main multiverse restricted universe
deb http://debian.ustc.edu.cn/ubuntu/ intrepid-security main multiverse restricted universe
deb http://debian.ustc.edu.cn/ubuntu/ intrepid-updates main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ intrepid main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ intrepid-backports main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ intrepid-proposed main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ intrepid-security main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ intrepid-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/ intrepid main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ intrepid main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ intrepid-updates main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ intrepid-updates main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ intrepid-backports main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ intrepid-backports main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ intrepid-security main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ intrepid-security main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ intrepid-proposed main multiverse restricted universe
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ intrepid-proposed main restricted universe multiverse
<
br />＃mirror.rootguide.org更新服务器（上海市 电信）：
deb http://mirror.rootguide.org/ubuntu/ intrepid main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ intrepid main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ intrepid-updates main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ intrepid-updates main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ intrepid-backports main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ intrepid-backports main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ intrepid-security main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ intrepid-security main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ intrepid-proposed main multiverse restricted universe
deb-src http://mirror.rootguide.org/ubuntu/ intrepid-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 intrepid main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu intrepid-security main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu intrepid-updates main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu intrepid-backports main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu intrepid-proposed main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu intrepid main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu intrepid-security main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu intrepid-updates main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu intrepid-backports main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu intrepid-proposed main restricted universe multiverse
