#兰州大学
deb ftp://mirror.lzu.edu.cn/ubuntu/ quantal main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ quantal-backports main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ quantal-proposed main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ quantal-security main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu/ quantal-updates main multiverse restricted universe
deb ftp://mirror.lzu.edu.cn/ubuntu-cn/ quantal main multiverse restricted universe
#上海交通大学（上海交大源，教育网的速度不用说了）
deb quantal main multiverse restricted universe
deb quantal-backports main multiverse restricted universe
deb quantal-proposed main multiverse restricted universe
deb quantal-security main multiverse restricted universe
deb quantal-updates main multiverse restricted universe
deb quantal main multiverse restricted universe
deb-src quantal main multiverse restricted universe
deb-src quantal-backports main multiverse restricted universe
deb-src quantal-proposed main multiverse restricted universe
deb-src quantal-security main multiverse restricted universe
deb-src quantal-updates main multiverse restricted universe
添加好后保存，再输入 sudo apt-get update 就可以更新了，等着慢慢下载东西吧。