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vim /etc/apt/sources.list.d/pve-enterprise.list
#注释掉
#deb https://enterprise.proxmox.com/debian/pve stretch pve-enterprise

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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

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apt update && apt dist-upgrade