官方文檔：
https://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_Stretch

方法1.進入編輯(我使用此方法)

nano /etc/apt/sources.list.d/pve-enterprise.list

將以下註釋掉

#deb https://enterprise.proxmox.com/debian/pve stretch pve-enterprise

方法2.删除掉

rm -f /etc/apt/sources.list.d/pve-enterprise.list

為了更新成功 proxmox 還需要執行以下三段指令

echo "deb http://download.proxmox.com/debian/pve stretch pve-no-subscription" > /etc/apt/sources.list.d/pve-install-repo.list

wget http://download.proxmox.com/debian/proxmox-ve-release-5.x.gpg -O /etc/apt/trusted.gpg.d/proxmox-ve-release-5.x.gpg

apt update && apt dist-upgrade

可以更新了: