装好ubuntu系统后的第一见事就是替换自带的更新源，原因是系统自带的源有些在中国访问不了，可以访问的速度又特别慢。幸好国内的一些公司和大学提供了速度不错的更新源。下面介绍如何使用更快的更新源

方法/步骤

  1. 备份sources.list文件：

         cp /etc/apt/sources.list etc-backup/etc-apt-source.list

  2.  打开sources.list：

        sudo gedit /etc/apt/sources.list

  3.  

    修改sources.list，将sources.list内容全部替换为以下内容：

    # 电子科大（教育网用户推荐）

    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

    # 中国科技大学（教育网用户推荐）

    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

    # 北京理工（教育网用户推荐）

    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

    # 163（非教育网推荐）

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

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

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

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

    deb http://mirrors.163.com/ubuntu/ precise universe

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

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

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

    deb http://mirrors.163.com/ubuntu/ precise multiverse

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

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

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

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

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

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

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

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

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

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

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

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

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

    # sohu（非教育网推荐）

    deb http://mirrors.sohu.com/ubuntu/ precise main restricted

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

    deb http://mirrors.sohu.com/ubuntu/ precise-updates main restricted

    deb-src http://mirrors.sohu.com/ubuntu/ precise-updates main restricted

    deb http://mirrors.sohu.com/ubuntu/ precise universe

    deb-src http://mirrors.sohu.com/ubuntu/ precise universe

    deb http://mirrors.sohu.com/ubuntu/ precise-updates universe

    deb-src http://mirrors.sohu.com/ubuntu/ precise-updates universe

    deb http://mirrors.sohu.com/ubuntu/ precise multiverse

    deb-src http://mirrors.sohu.com/ubuntu/ precise multiverse

    deb http://mirrors.sohu.com/ubuntu/ precise-updates multiverse

    deb-src http://mirrors.sohu.com/ubuntu/ precise-updates multiverse

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

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

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

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

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

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

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

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

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

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

  4.  

    保存对source.list的修改。

  5.  

    更新源信息：

        sudo apt-get update

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