轉貼自: http://datalinks.blog.sohu.com/80279400.html
默認的中國源速度非常不錯，爲了保證源內軟件的齊全，建議電信用戶添加cn99或臺灣大學的源，建議網通用戶添加UBNTU官方或臺灣大學的源。
•
在終端輸入並運行
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup （備份當前的源列表，以便日後需要時恢復）
sudo gedit /etc/apt/sources.list （修改sources.list文件中源的列表）
彈出文本後在sources.list文件中尾部添加下列內容：
ubuntu8.10的163源爲：
deb http://mirrors.163.com/ubuntu/ intrepid main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ intrepid-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ intrepid-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ intrepid-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ intrepid-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ intrepid main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ intrepid-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ intrepid-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ intrepid-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ 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源爲：
deb http://mirrors.163.com/ubuntu/ hardy main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ hardy-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ hardy-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ hardy-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ hardy-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ hardy main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ hardy-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ hardy-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ hardy-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ hardy-backports main restricted universe multiverse
#Mirror.lupaworld.com 源更新服務器（浙江省杭州市雙線服務器，網通同電信都可以用，亞洲地區官方更新服務器）：
deb http://mirror.lupaworld.com/ubuntu gutsy main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu gutsy-security main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu gutsy-updates main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu gutsy-backports main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu gutsy main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu gutsy-security main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu gutsy-updates main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu gutsy-backports main restricted universe multiverse
Ubuntu 官方源 推薦北方網通用戶添加
deb http://archive.ubuntu.com/ubuntu/ gutsy main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ gutsy-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ gutsy-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ gutsy-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ gutsy-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ gutsy main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ gutsy-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ gutsy-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ gutsy-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ gutsy-backports main restricted universe multiverse
臺灣的官方源速度也相當不錯，有時甚至快於內地的：
deb http://tw.archive.ubuntu.com/ubuntu gutsy main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu gutsy-security main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu gutsy-updates main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu gutsy-backports main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu gutsy-proposed main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu gutsy main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu gutsy-security main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu gutsy-updates main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu gutsy-backports main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu gutsy-proposed main restricted universe multiverse
再加個中國電信源科技大學的源（能用速度還不 錯）
deb http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-backports main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-proposed main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-security main restricted universe multiverse
deb http://ubuntu.uestc.edu.cn/ubuntu/ hardy-updates main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ intrepid main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-backports main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-proposed main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-security main restricted universe multiverse
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ intrepid-updates main restricted universe multiverse
防止非官方源中軟件包不全的問題，請在sources.list文件中尾部添加下面這個官方源。
deb http://archive.ubuntu.org.cn/ubuntu-cn/ feisty main restricted universe multiverse
如果沒有這個源，下面安裝某些軟件的時候會提示找不到，比如w32codecs
然後 保存編輯好的文件，執行以下命令更新。
sudo apt-get update #這一步是更新你的源列表，換源後必須執行
（如果更新速度非常慢請更換源 sudo gedit /etc/apt/sources.list ）
sudo apt-get dist-upgrade #這一步是更新軟件
臺灣源的測試可能會慢一些，耐心等一下，換源後一般下載速度都有幾十K，上百K也很正常。～要是總是用幾K的外源，Ubuntu也不可能在PRC混了 ～