1. First Step:　

  1. sudo gedit /etc/apt/sources.list

2. Add Soures List Content:

  1.  # deb cdrom:[Ubuntu 12.04. LTS _Precise Pangolin_ - Release i386 (20120817.3)]/ precise main restricted
  2.  
  3.  # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
  4.  # newer versions of the distribution.
  5.  
  6.  #Tanwan
  7.  deb http://tw.archive.ubuntu.com/ubuntu/ precise main universe restricted multiverse
  8.  deb-src http://tw.archive.ubuntu.com/ubuntu/ precise main universe restricted multiverse
  9.  deb http://tw.archive.ubuntu.com/ubuntu/ precise-security universe main multiverse restricted
  10.  deb-src http://tw.archive.ubuntu.com/ubuntu/ precise-security universe main multiverse restricted
  11.  deb http://tw.archive.ubuntu.com/ubuntu/ precise-updates universe main multiverse restricted
  12.  deb-src http://tw.archive.ubuntu.com/ubuntu/ precise-updates universe main multiverse restricted
  13.  
  14.  #Wangyi
  15.  deb http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse
  16.  deb-src http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse
  17.  deb http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted
  18.  deb-src http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted
  19.  deb http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted
  20.  deb http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted
  21.  deb-src http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted
  22.  deb http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted
  23.  deb-src http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted
  24.  deb-src http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted
  25.  
  26.  #Bone Source
  27.  deb http://ubuntu.srt.cn/ubuntu/ precise main universe restricted multiverse
  28.  deb-src http://ubuntu.srt.cn/ubuntu/ precise main universe restricted multiverse
  29.  deb http://ubuntu.srt.cn/ubuntu/ precise-security universe main multiverse restricted
  30.  deb-src http://ubuntu.srt.cn/ubuntu/ precise-security universe main multiverse restricted
  31.  deb http://ubuntu.srt.cn/ubuntu/ precise-updates universe main multiverse restricted
  32.  deb http://ubuntu.srt.cn/ubuntu/ precise-proposed universe main multiverse restricted
  33.  deb-src http://ubuntu.srt.cn/ubuntu/ precise-proposed universe main multiverse restricted
  34.  deb http://ubuntu.srt.cn/ubuntu/ precise-backports universe main multiverse restricted
  35.  deb-src http://ubuntu.srt.cn/ubuntu/ precise-backports universe main multiverse restricted
  36.  deb-src http://ubuntu.srt.cn/ubuntu/ precise-updates universe main multiverse restricted
  37.  
  38.  #mirror.lupaworld.com
  39.  deb http://mirror.lupaworld.com/ubuntu/archive/ precise main restricted universe multiverse
  40.  deb http://mirror.lupaworld.com/ubuntu/archive/ precise-security main restricted universe multiverse
  41.  deb http://mirror.lupaworld.com/ubuntu/archive/ precise-updates main restricted universe multiverse
  42.  deb http://mirror.lupaworld.com/ubuntu/archive/ precise-backports main restricted universe multiverse
  43.  deb http://mirror.lupaworld.com/ubuntu/ubuntu-cn/ precise main restricted universe multiverse
  44.  
  45.  #ubuntu.cn99.com
  46.  deb http://ubuntu.cn99.com/ubuntu/ precise main restricted universe multiverse
  47.  deb http://ubuntu.cn99.com/ubuntu/ precise-updates main restricted universe multiverse
  48.  deb http://ubuntu.cn99.com/ubuntu/ precise-security main restricted universe multiverse
  49.  deb http://ubuntu.cn99.com/ubuntu/ precise-backports main restricted universe multiverse
  50.  deb http://ubuntu.cn99.com/ubuntu-cn/ precise main restricted universe multiverse
  51.  
  52.  #Electric University
  53.  deb http://ubuntu.uestc.edu.cn/ubuntu/ precise main restricted universe multiverse
  54.  deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse
  55.  deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
  56.  deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiverse
  57.  deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse
  58.  deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise main restricted universe multiverse
  59.  deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse
  60.  deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
  61.  deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiverse
  62.  deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse
  63.  
  64.  #China Eletric University
  65.  deb http://debian.ustc.edu.cn/ubuntu/ precise main restricted universe multiverse
  66.  deb http://debian.ustc.edu.cn/ubuntu/ precise-backports restricted universe multiverse
  67.  deb http://debian.ustc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
  68.  deb http://debian.ustc.edu.cn/ubuntu/ precise-security main restricted universe multiverse
  69.  deb http://debian.ustc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse
  70.  deb-src http://debian.ustc.edu.cn/ubuntu/ precise main restricted universe multiverse
  71.  deb-src http://debian.ustc.edu.cn/ubuntu/ precise-backports main restricted universe multiverse
  72.  deb-src http://debian.ustc.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
  73.  deb-src http://debian.ustc.edu.cn/ubuntu/ precise-security main restricted universe multiverse
  74.  deb-src http://debian.ustc.edu.cn/ubuntu/ precise-updates main restricted universe multiverse
  75.  
  76.  #Shanghai jiaotong
  77.  deb http://ftp.sjtu.edu.cn/ubuntu/ precise main multiverse restricted universe
  78.  deb http://ftp.sjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe
  79.  deb http://ftp.sjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe
  80.  deb http://ftp.sjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe
  81.  deb http://ftp.sjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe
  82.  deb http://ftp.sjtu.edu.cn/ubuntu-cn/ precise main multiverse restricted universe
  83.  deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise main multiverse restricted universe
  84.  deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise-backports main multiverse restricted universe
  85.  deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise-proposed main multiverse restricted universe
  86.  deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise-security main multiverse restricted universe
  87.  deb-src http://ftp.sjtu.edu.cn/ubuntu/ precise-updates main multiverse restricted universe

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

  1. apt-get update

4. Waiting....Done!!

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