I'm new of this forum.
I would test ghostBSD on my t400 with libreboot.
I dded the iso on a usb drive and it start normally on virt-manager but not on my libreboot.
This guide is not good: https://libreboot.org/docs/bsd/freebsd.html
I changed any parameter and the first row
give me an error: anknow file systemkfreebsd (usb0,gpt3)/boot/kernel/kernel
Any suggestion?