After doing an `apt update` and then an `apt upgrade` my proxmox server no longer boots. Old kernel (which i can manually select and boot from) is 4.15.10-1. There is no subscription, so the updates were from pve-nosubscription. The hardware is a HP DL380p G8. This is easily reproducable for me, i just need to reboot and select the -5 kernel revision. Any thoughts or advice would be appreciated. I know nosubscription is unsupported, but this seems like an unexpected breakage.