The workaround I have found at this point is to rebuild grub after migrating to XCP-NG. Adds a few minutes to each VM but I don't have that many. Boot to live iso in UEFI mode (I used Debian12 given it was a Debian12 vm) sudo su - mount /dev/mapper/????? /mnt mount /dev/xvda2 /mnt/boot mount /dev/xvda1 /mnt/boot/efi for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done mount --bind /sys/firmware/efi/efivars /mnt/sys/firmware/efi/efivars chroot /mnt grub-install /dev/xvda update-grub exit shutdown now I'm using LVM so adjust the first mount to match your root partition. I shutdown so that I can remove iso and boot when I'm ready. Hope this saves somebody a bunch of frustration in the future.