修改/etc/apt/sources.list文件，添加下面（自由选择镜像）：

#北京交通大学
deb http://mirror.bjtu.edu.cn/deepin/ precise main non-free
deb-src http://mirror.bjtu.edu.cn/deepin/ precise main non-free

deb http://mirror.bjtu.edu.cn/deepin/ oneiric-updates main non-free
deb-src http://mirror.bjtu.edu.cn/deepin/ oneiric-updates main non-free

#中国科技大学
deb http://mirrors.ustc.edu.cn/deepin/ precise main non-free
deb-src http://mirrors.ustc.edu.cn/deepin/ precise main non-free

deb http://mirrors.ustc.edu.cn/deepin/ precise-updates main non-free
deb-src http://mirrors.ustc.edu.cn/deepin/ precise-updates main non-free



#清华大学
deb http://mirrors.tuna.tsinghua.edu.cn/deepin/ precise main non-free
deb-src http://mirrors.tuna.tsinghua.edu.cn/deepin/ precise main non-free

deb http://mirrors.tuna.tsinghua.edu.cn/deepin/ oneiric-updates main non-free
deb-src http://mirrors.tuna.tsinghua.edu.cn/deepin/ oneiric-updates main non-free


#天津大学（仅IPv4）
deb http://mirror.tju.edu.cn/deepin/ precise main non-free
deb-src http://mirror.tju.edu.cn/deepin/ precise main non-free

deb http://mirror.tju.edu.cn/deepin/ precise-updates main non-free
deb-src http://mirror.tju.edu.cn/deepin/ precise-updates main non-free

#天津大学ftp（仅IPv4）不用
deb ftp://mirror.tju.edu.cn/deepin/ precise main non-free
deb-src ftp://mirror.tju.edu.cn/deepin/ precise main non-free

deb ftp://mirror.tju.edu.cn/deepin/ precise-updates main non-free
deb-src ftp://mirror.tju.edu.cn/deepin/ precise-updates main non-free

#天津大学ftp（IPv4/IPv6）
deb http://jx.tju.zyrj.org/deepin/ precise main non-free
deb-src http://jx.tju.zyrj.org/deepin/ precise main non-free

deb http://jx.tju.zyrj.org/deepin/ precise-updates main non-free
deb-src http://jx.tju.zyrj.org/deepin/ precise-updates main non-free