We recently powered down one of our Proxmox servers, and on reboot we're hitting a GRUB error (see below for a screenshot) stating that a device is not found. There have been no hardware changes on this server for the past year, and it has been rebooted several times without error before now. I've tried booting into the debug installer for PVE 5.1 as described here, and running the install-grub, update-grub2 and update-initramfs described here, but with no luck so far. The commands complete without reporting any errors, but upon rebooting I hit the same now familiar GRUB error. I also tried backing up the existing VMs whilst chrooted into the ZFS system from the installer, but it looks like vzdump relies on a whole bunch of services to be running such as DBus and pve-cluster and such which didn't want to cooperate whilst inside a chroot. If anybody has any ideas on eithe rhow to recover the existing system or create a backup of the two KVM VMs that were running inside it from a rescue session, I'd much appreciate it.