cp /etc/apt/sources.list /etc/apt/sources.list.backup sudo gedit /etc/apt/sources.list
#中科大的源，教育网推荐 deb http://debian.ustc.edu.cn/ubuntu/ lucid main restricted universe multiverse deb http://debian.ustc.edu.cn/ubuntu/ lucid-backports restricted universe multiverse deb http://debian.ustc.edu.cn/ubuntu/ lucid-proposed main restricted universe multiverse deb http://debian.ustc.edu.cn/ubuntu/ lucid-security main restricted universe multiverse deb http://debian.ustc.edu.cn/ubuntu/ lucid-updates main restricted universe multiverse deb-src http://debian.ustc.edu.cn/ubuntu/ lucid main restricted universe multiverse deb-src http://debian.ustc.edu.cn/ubuntu/ lucid-backports main restricted universe multiverse deb-src http://debian.ustc.edu.cn/ubuntu/ lucid-proposed main restricted universe multiverse deb-src http://debian.ustc.edu.cn/ubuntu/ lucid-security main restricted universe multiverse deb-src http://debian.ustc.edu.cn/ubuntu/ lucid-updates main restricted universe multiverse #北京交大的源，教育网 deb http://mirror.bjtu.edu.cn/ubuntu/ lucid main multiverse restricted universe deb http://mirror.bjtu.edu.cn/ubuntu/ lucid-backports main multiverse restricted universe deb http://mirror.bjtu.edu.cn/ubuntu/ lucid-proposed main multiverse restricted universe deb http://mirror.bjtu.edu.cn/ubuntu/ lucid-security main multiverse restricted universe deb http://mirror.bjtu.edu.cn/ubuntu/ lucid-updates main multiverse restricted universe deb-src http://mirror.bjtu.edu.cn/ubuntu/ lucid main multiverse restricted universe deb-src http://mirror.bjtu.edu.cn/ubuntu/ lucid-backports main multiverse restricted universe deb-src http://mirror.bjtu.edu.cn/ubuntu/ lucid-proposed main multiverse restricted universe deb-src http://mirror.bjtu.edu.cn/ubuntu/ lucid-security main multiverse restricted universe deb-src http://mirror.bjtu.edu.cn/ubuntu/ lucid-updates main multiverse restricted universe #上海交大的源 deb http://ftp.sjtu.edu.cn/ubuntu/ lucid main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu/ lucid-backports main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu/ lucid-proposed main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu/ lucid-security main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu/ lucid-updates main multiverse restricted universe deb-src http://ftp.sjtu.edu.cn/ubuntu/ lucid main multiverse restricted universe deb-src http://ftp.sjtu.edu.cn/ubuntu/ lucid-backports main multiverse restricted universe deb-src http://ftp.sjtu.edu.cn/ubuntu/ lucid-proposed main multiverse restricted universe deb-src http://ftp.sjtu.edu.cn/ubuntu/ lucid-security main multiverse restricted universe deb-src http://ftp.sjtu.edu.cn/ubuntu/ lucid-updates main multiverse restricted universe #再来一个163的。电信教育网通用 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
添加完成后，更新源
sudo apt-get update