iohyve not booting ubuntu18.04 and stuck at grub> command

[emanzx]

I have successfully install ubuntu 18.04 using latest iso. but when I start the VM it stuck at grub>
instruction here help me pass the grub menu. http://kflu.github.io/2020/04/08/2020-04-08-freebsd-bhyve/
but I cannot add grub_run_partition="2" configs.
I try iohyve set ubuntu18 grub_run_partition="2" and it was added to configuration but when I boot the ubuntu again it just stuck at grub again. my ubuntu installation does not use LVM