debian 9 stretch 更新源，debianstretch更新

debian 9 stretch 修改为清华大学更新源

• 1，修改 debian更新源

1，修改 debian更新源

vim /etc/apt/sources.list

#官网源
deb http://deb.debian.org/debian/ stretch main
deb-src http://deb.debian.org/debian/ stretch main
deb http://security.debian.org/ stretch/updates main
deb-src http://security.debian.org/ stretch/updates main
deb http://deb.debian.org/debian/ stretch-updates main
deb-src http://deb.debian.org/debian/ stretch-updates main

#清华大学更新源
# 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 https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian-security stretch/updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security stretch/updates main contrib non-free

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