Hello,
I have a problem upgrading proxmox 3.4 to 4.4 on VPS server.
i used this howto https://pve.proxmox.com/wiki/Upgrade_from_3.x_to_4.0.
Every thing went well, even the step apt-get dist-upgrade without error. After that they ask for reboot.
my server didn't reboot.
This happend to me...