Debian 10 apt 使用阿里云镜像

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最近打算在 Debian 上折腾 KVM，在阿里云官网的教程里没找到 Debian 10 的源，遂自己动手。

# 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.aliyun.com/debian/ buster main contrib non-free
# deb-src http://mirrors.aliyun.com/debian/ buster main contrib non-free
deb http://mirrors.aliyun.com/debian/ buster-updates main contrib non-free
# deb-src http://mirrors.aliyun.com/debian/ buster-updates main contrib non-free
deb http://mirrors.aliyun.com/debian/ buster-backports main contrib non-free
# deb-src http://mirrors.aliyun.com/debian/ buster-backports main contrib non-free
deb http://mirrors.aliyun.com/debian-security buster/updates main contrib non-free
# deb-src http://mirrors.aliyun.com/debian-security buster/updates main contrib non-free