vim /etc/apt/sources.list
deb http://mirrors.163.com/debian squeeze main non-free contrib
deb http://mirrors.163.com/debian squeeze-proposed-updates main contrib non-free
deb http://mirrors.163.com/debian-security squeeze/updates main contrib non-free
deb-src http://mirrors.163.com/debian squeeze main non-free contrib
deb-src http://mirrors.163.com/debian squeeze-proposed-updates main contrib non-free
deb-src http://mirrors.163.com/debian-security squeeze/updates main contrib non-free
deb http://http.us.debian.org/debian squeeze main contrib non-free
deb http://security.debian.org squeeze/updates main contrib non-free
deb http://ftp.debian.org/debian squeeze main contrib non-free