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