deb http://mirrors.163.com/debian-archive/debian/ stretch main non-free contrib
deb http://mirrors.163.com/debian-archive/debian/ stretch-backports main non-free contrib
deb-src http://mirrors.163.com/debian-archive/debian/ stretch main non-free contrib
deb-src http://mirrors.163.com/debian-archive/debian/ stretch-backports main non-free contrib
deb http://mirrors.163.com/debian-archive/debian-security/ stretch/updates main non-free contrib
deb-src http://mirrors.163.com/debian-archive/debian-security/ stretch/updates main non-free contrib
变了
其它仓库的配置可参考下：
deb http://mirrors.cloud.aliyuncs.com/debian-archive/debian stretch main contrib non-free
deb http://mirrors.cloud.aliyuncs.com/debian-archive/debian stretch-proposed-updates main non-free contrib
deb http://mirrors.cloud.aliyuncs.com/debian-archive/debian stretch-backports main non-free contrib
deb http://mirrors.cloud.aliyuncs.com/debian-archive/debian-security stretch/updates main contrib non-free
deb-src http://mirrors.cloud.aliyuncs.com/debian-archive/debian stretch main contrib non-free
deb-src http://mirrors.cloud.aliyuncs.com/debian-archive/debian stretch-proposed-updates main contrib non-free
deb-src http://mirrors.cloud.aliyuncs.com/debian-archive/debian stretch-backports main contrib non-free
deb-src http://mirrors.cloud.aliyuncs.com/debian-archive/debian-security stretch/updates main contrib non-free
还有这个：
deb http://archive.debian.org/debian/ stretch main contrib non-free
deb-src http://archive.debian.org/debian/ stretch main contrib non-free
deb http://archive.debian.org/debian-security/ stretch/updates main contrib non-free
deb-src http://archive.debian.org/debian-security/ stretch/updates main contrib non-free
deb http://archive.debian.org/debian/ stretch-backports main contrib non-free
?