1. First Step:　

sudo gedit /etc/apt/sources.list

2. Add Soures List Content:

 # deb cdrom:[Ubuntu 12.04. LTS _Precise Pangolin_ - Release i386 (20120817.3)]/ precise main restricted

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

 # newer versions of the distribution.

 #Tanwan

 deb http://tw.archive.ubuntu.com/ubuntu/ precise main universe restricted multiverse

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

 deb http://tw.archive.ubuntu.com/ubuntu/ precise-security universe main multiverse restricted

 deb-src http://tw.archive.ubuntu.com/ubuntu/ precise-security universe main multiverse restricted

 deb http://tw.archive.ubuntu.com/ubuntu/ precise-updates universe main multiverse restricted

 deb-src http://tw.archive.ubuntu.com/ubuntu/ precise-updates universe main multiverse restricted

 #Wangyi

 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

 #Bone Source

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

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

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

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

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

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

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

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

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

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

 #mirror.lupaworld.com

 deb http://mirror.lupaworld.com/ubuntu/archive/ precise main restricted universe multiverse

 deb http://mirror.lupaworld.com/ubuntu/archive/ precise-security main restricted universe multiverse

 deb http://mirror.lupaworld.com/ubuntu/archive/ precise-updates main restricted universe multiverse

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

 deb http://mirror.lupaworld.com/ubuntu/ubuntu-cn/ precise main restricted universe multiverse

 #ubuntu.cn99.com

 deb http://ubuntu.cn99.com/ubuntu/ precise main restricted universe multiverse

 deb http://ubuntu.cn99.com/ubuntu/ precise-updates main restricted universe multiverse

 deb http://ubuntu.cn99.com/ubuntu/ precise-security main restricted universe multiverse

 deb http://ubuntu.cn99.com/ubuntu/ precise-backports main restricted universe multiverse

 deb http://ubuntu.cn99.com/ubuntu-cn/ precise main restricted universe multiverse

 #Electric University

 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

 #China Eletric University

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

 deb http://debian.ustc.edu.cn/ubuntu/ precise-backports restricted universe multiverse

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

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

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

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

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

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

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

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

 #Shanghai jiaotong

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

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

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

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

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

 deb http://ftp.sjtu.edu.cn/ubuntu-cn/ precise main multiverse restricted universe

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

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

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

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

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

3. Close soures.list file ,then input command to update:

apt-get update

4. Waiting....Done!!

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