修改etc/apt/sources.list文件
deb http://mirrors.163.com/ubuntu/ lucid main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ lucid-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ lucid-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ lucid-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ lucid-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ lucid main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ lucid-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ lucid-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ lucid-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ lucid-backports main restricted universe multiverse
deb http://mirrors.sohu.com/ubuntu/ lucid main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ lucid-security main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ lucid-updates main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ lucid-proposed main restricted universe multiverse deb http://mirrors.sohu.com/ubuntu/ lucid-backports main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ lucid main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ lucid-security main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ lucid-updates main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ lucid-proposed main restricted universe multiverse deb-src http://mirrors.sohu.com/ubuntu/ lucid-backports main restricted universe multiverse
原文：http://www.cnblogs.com/wangzhongqiu/p/6509473.html