# vi /etc/apt/sources.list
deb http://ftp.debian.org/debian stretch main contrib deb http://ftp.debian.org/debian stretch-updates main contrib deb http://ftp.hk.debian.org/debian stretch main contrib deb http://download.proxmox.com/debian/pve stretch pve-no-subscription deb http://ftp.hk.debian.org/debian stretch-updates main contrib # security updates deb http://security.debian.org stretch/updates main contrib
最后：
apt update && apt dist-upgrade
Proxmox 5.x 升级到 6.x
执行以下指令：
echo "deb https://enterprise.proxmox.com/debian/pve buster pve-enterprise" > /etc/apt/sources.list.d/pve-enterprise.list
sed -i 's/stretch/buster/g' /etc/apt/sources.list
apt update
apt dist-upgrade