几个比较常用和速度不错的ubuntu更新源

默认的中国源速度非常不错，为了保证源内软件的齐全，建议电信用户添加cn99或台湾大学的源，建议网通用户添加UBNTU官方或台湾大学的源。
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在终端输入并运行
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup （备份当前的源列表，以便日後需要时恢复）
sudo gedit /etc/apt/sources.list （修改sources.list文件中源的列表）
弹出文本后在sources.list文件中尾部添加下列内容：

ubuntu8.10的163源为：

deb intrepid main restricted universe multiverse
deb intrepid-security main restricted universe multiverse
deb intrepid-updates main restricted universe multiverse
deb intrepid-proposed main restricted universe multiverse
deb intrepid-backports main restricted universe multiverse
deb-src intrepid main restricted universe multiverse
deb-src intrepid-security main restricted universe multiverse
deb-src intrepid-updates main restricted universe multiverse
deb-src intrepid-proposed main restricted universe multiverse
deb-src intrepid-backports main restricted universe multiverse

CN99

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

ubuntu 8.04的163源为：

deb hardy main restricted universe multiverse
deb hardy-security main restricted universe multiverse
deb hardy-updates main restricted universe multiverse
deb hardy-proposed main restricted universe multiverse
deb hardy-backports main restricted universe multiverse
deb-src hardy main restricted universe multiverse
deb-src hardy-security main restricted universe multiverse
deb-src hardy-updates main restricted universe multiverse
deb-src hardy-proposed main restricted universe multiverse
deb-src hardy-backports main restricted universe multiverse

#Mirror.lupaworld.com 源更新服务器（浙江省杭州市双线服务器，网通同电信都可以用，亚洲地区官方更新服务器）：
deb gutsy main restricted universe multiverse
deb gutsy-security main restricted universe multiverse
deb gutsy-updates main restricted universe multiverse
deb gutsy-backports main restricted universe multiverse
deb-src gutsy main restricted universe multiverse
deb-src gutsy-security main restricted universe multiverse
deb-src gutsy-updates main restricted universe multiverse
deb-src gutsy-backports main restricted universe multiverse

Ubuntu 官方源 推荐北方网通用户添加
deb gutsy main restricted universe multiverse
deb gutsy-security main restricted universe multiverse
deb gutsy-updates main restricted universe multiverse
deb gutsy-proposed main restricted universe multiverse
deb gutsy-backports main restricted universe multiverse
deb-src gutsy main restricted universe multiverse
deb-src gutsy-security main restricted universe multiverse
deb-src gutsy-updates main restricted universe multiverse
deb-src gutsy-proposed main restricted universe multiverse
deb-src gutsy-backports 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 gutsy main restricted universe multiverse
deb gutsy-security main restricted universe multiverse
deb gutsy-updates main restricted universe multiverse
deb gutsy-backports main restricted universe multiverse
deb gutsy-proposed main restricted universe multiverse
deb-src gutsy main restricted universe multiverse
deb-src gutsy-security main restricted universe multiverse
deb-src gutsy-updates main restricted universe multiverse
deb-src gutsy-backports main restricted universe multiverse
deb-src gutsy-proposed main restricted universe multiverse

再加个中国电信源科技大学的源（能用速度还不 错）

deb intrepid main restricted universe multiverse
deb intrepid-backports main restricted universe multiverse
deb intrepid-proposed main restricted universe multiverse
deb intrepid-security main restricted universe multiverse
deb hardy-updates main restricted universe multiverse
deb-src intrepid main restricted universe multiverse
deb-src intrepid-backports main restricted universe multiverse
deb-src intrepid-proposed main restricted universe multiverse
deb-src intrepid-security main restricted universe multiverse
deb-src intrepid-updates main restricted universe multiverse

deb jaunty main restricted universe multiverse
deb jaunty-backports restricted universe multiverse
deb jaunty-proposed main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
deb-src jaunty-proposed main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
#传说中的北京交大 速度 2M/s
deb jaunty main restricted universe multiverse
deb jaunty-backports restricted universe multiverse
deb jaunty-proposed main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
deb-src jaunty-proposed main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
#传说中的上海交通大学，最热门的源之一
deb jaunty main multiverse restricted universe
deb jaunty-backports main multiverse restricted universe
deb jaunty-proposed main multiverse restricted universe
deb jaunty-security main multiverse restricted universe
deb jaunty-updates main multiverse restricted universe
deb jaunty main multiverse restricted universe
deb-src jaunty main multiverse restricted universe
deb-src jaunty-backports main multiverse restricted universe
deb-src jaunty-proposed main multiverse restricted universe
deb-src jaunty-security main multiverse restricted universe
deb-src jaunty-updates main multiverse restricted universe
#传说中的清华大学ubuntu源 300k/s
deb jaunty main restricted universe multiverse
deb jaunty-backports restricted universe multiverse
deb jaunty-proposed main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
deb-src jaunty-proposed main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
#传说中的兰州大学 260k/s
deb jaunty main restricted universe multiverse
deb jaunty-backports restricted universe multiverse
deb jaunty-proposed main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
deb-src jaunty-proposed main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
#传说中的台湾大学 中国电信adsl 150k/s
deb jaunty main restricted universe multiverse
deb jaunty-backports restricted universe multiverse
deb jaunty-proposed main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
deb-src jaunty-proposed main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse

电信网：
deb jaunty main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
deb jaunty-backports main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb jaunty-proposed main multiverse restricted universe
deb-src jaunty-proposed main restricted universe multiverse

防止非官方源中软件包不全的问题，请在sources.list文件中尾部添加下面这个官方源。

deb feisty main restricted universe multiverse

如果没有这个源，下面安装某些软件的时候会提示找不到，比如w32codecs
然后 保存编辑好的文件，执行以下命令更新。
sudo apt-get update #这一步是更新你的源列表，换源後必须执行
（如果更新速度非常慢请更换源 sudo gedit /etc/apt/sources.list ）
sudo apt-get dist-upgrade #这一步是更新软件

台湾源的测试可能会慢一些，耐心等一下，换源后一般下载速度都有几十K，上百K也很正常。～要是总是用几K的外源，Ubuntu也不可能在PRC混了 ～