apt update
apt upgrade
nano source.list
deb http://mirrors.163.com/debian buster main contrib non-free
deb http://mirrors.163.com/debian buster-updates main contrib non-free
deb http://mirrors.163.com/debian-security/ buster/updates main contrib non-free
apt update
apt upgrade
apt dist-upgrade

 

root@Gate:/etc/apt# cat /etc/debian_version
10.0