官方源：

 #deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release i386 (20120423)]/ precise main restricted

 # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to

 # newer versions of the distribution.

 deb http://us.archive.ubuntu.com/ubuntu/ precise main restricted

 deb-src http://us.archive.ubuntu.com/ubuntu/ precise main restricted

 ## Major bug fix updates produced after the final release of the

 ## distribution.

 deb http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted

 deb-src http://us.archive.ubuntu.com/ubuntu/ precise-updates main restricted

 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu

 ## team. Also, please note that software in universe WILL NOT receive any

 ## review or updates from the Ubuntu security team.

 deb http://us.archive.ubuntu.com/ubuntu/ precise universe

 deb-src http://us.archive.ubuntu.com/ubuntu/ precise universe

 deb http://us.archive.ubuntu.com/ubuntu/ precise-updates universe

 deb-src http://us.archive.ubuntu.com/ubuntu/ precise-updates universe

 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu

 ## team, and may not be under a free licence. Please satisfy yourself as to

 ## your rights to use the software. Also, please note that software in

 ## multiverse WILL NOT receive any review or updates from the Ubuntu

 ## security team.

 deb http://us.archive.ubuntu.com/ubuntu/ precise multiverse

 deb-src http://us.archive.ubuntu.com/ubuntu/ precise multiverse

 deb http://us.archive.ubuntu.com/ubuntu/ precise-updates multiverse

 deb-src http://us.archive.ubuntu.com/ubuntu/ precise-updates multiverse

 ## N.B. software from this repository may not have been tested as

 ## extensively as that contained in the main release, although it includes

 ## newer versions of some applications which may provide useful features.

 ## Also, please note that software in backports WILL NOT receive any review

 ## or updates from the Ubuntu security team.

 deb http://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse

 deb-src http://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse

 deb http://security.ubuntu.com/ubuntu precise-security main restricted

 deb-src http://security.ubuntu.com/ubuntu precise-security main restricted

 deb http://security.ubuntu.com/ubuntu precise-security universe

 deb-src http://security.ubuntu.com/ubuntu precise-security universe

 deb http://security.ubuntu.com/ubuntu precise-security multiverse

 deb-src http://security.ubuntu.com/ubuntu precise-security multiverse

 ## Uncomment the following two lines to add software from Canonical's

 ## 'partner' repository.

 ## This software is not part of Ubuntu, but is offered by Canonical and the

 ## respective vendors as a service to Ubuntu users.

 # deb http://archive.canonical.com/ubuntu precise partner

 # deb-src http://archive.canonical.com/ubuntu precise partner

 ## This software is not part of Ubuntu, but is offered by third-party

 ## developers who want to ship their latest software.

 deb http://extras.ubuntu.com/ubuntu precise main

 deb-src http://extras.ubuntu.com/ubuntu precise main

使用命令

 sudo gedit /etc/apt/sources.list

替换为中国本地源

 #163

 deb http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse

 deb-src http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse

 deb http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted

 deb-src http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted

 deb http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted

 deb http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted

 deb-src http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted

 deb http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted

 deb-src http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted

 deb-src http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted

 #dianzi keji daxue

 deb http://ubuntu.uestc.edu.cn/ubuntu/ precise main restricted universe multiverse

 deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse

 deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse

 deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiverse

 deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse

 deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise main restricted universe multiverse

 deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse

 deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse

 deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiverse

 deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse

 #beijing ligong daxue

 deb http://mirror.bjtu.edu.cn/ubuntu/ precise main multiverse restricted universe

 deb http://mirror.bjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe

 deb http://mirror.bjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe

 deb http://mirror.bjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe

 deb http://mirror.bjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe

 deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise main multiverse restricted universe

 deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe

 deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe

 deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe

 deb-src http://mirror.bjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe

更新源到系统：

 sudo apt-get update

 sudo apt-get upgrade

搞定，OK，速度提升了几倍！

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