ubuntu9.10源
deb http://run.hit.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb http://run.hit.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://run.hit.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://run.hit.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb http://run.hit.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
deb-src http://run.hit.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb-src http://run.hit.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src http://run.hit.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://run.hit.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb-src http://run.hit.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
ubuntu10.04源
deb http://run.hit.edu.cn/ubuntu/ lucid main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ lucid main restricted universe multiverse
deb http://run.hit.edu.cn/ubuntu/ lucid-updates main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ lucid-updates main restricted universe multiverse
deb http://run.hit.edu.cn/ubuntu/ lucid-backports main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ lucid-backports main restricted universe multiverse
deb http://run.hit.edu.cn/ubuntu/ lucid-security main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ lucid-security main restricted universe multiverse
哈工大的源：12.04
哈尔滨工业大学更新服务器，包含其他开源镜像：
deb http://run.hit.edu.cn/ubuntu/ precise main restricted universe multiverse
deb http://run.hit.edu.cn/ubuntu/ precise-security main restricted universe multiverse
deb http://run.hit.edu.cn/ubuntu/ precise-updates main restricted universe multiverse
deb http://run.hit.edu.cn/ubuntu/ precise-backports main restricted universe multiverse
deb http://run.hit.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ precise main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ precise-security main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ precise-updates main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://run.hit.edu.cn/ubuntu/ precise-proposed main restricted universe multiverse
有了源之后怎么改呢？
sudo gedit /etc/apt/source.list
然后复制粘贴覆盖掉里面全部东西（不要不舍得。。。）
最后：
sudo apt-get update即可
