# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb http://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
# deb-src http://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
# deb-src http://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
# deb-src http://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian-security stretch/updates main contrib non-free
# deb-src http://mirrors.tuna.tsinghua.edu.cn/debian-security stretch/updates main contrib non-free