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-security buster/updates main contrib non-free

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