想把proxmox 升级到最新的5.2.x 需要增加升级源
#vi /etc/apt/sources.list 增加下面红字行
Proxmox 5.0.x 升级 5.1.x 的升级源
#deb http://ftp.hk.debian.org/debian stretch main contrib
deb http://ftp.debian.org/debian stretch main contrib
deb http://download.proxmox.com/debian/pve stretch pve-no-subscription
# security updates
#deb http://security.debian.org stretch/updates main contrib
deb http://security.debian.org stretch/updates main contrib