1.不进行这一步，会遇到认证失败的情况，无法更新

vi /etc/apt/sources.list.d/pve-enterprise.list
deb http://download.proxmox.wiki/debian/pve buster pve-no-subscription

2.更改国内源

vi /etc/apt/sources.list

#注释掉原来的内容即可，没必要删掉。把下面内容写进去。

deb http://mirrors.163.com/debian buster main contrib
deb http://mirrors.163.com/debian buster-updates main contrib
# security updates
deb http://mirrors.163.com/debian-security/ buster/updates main contrib

3.最后执行更新

apt update
apt dist-upgrade #如需升级pve，则执行该命令