With some discussion on another forum, I found an answer. In addition to 1-4, 5. Add the following menuentry in REFIND.CONF. menuentry "GhostBSD on Internal disk" { icon /EFI/Boot/ICONS/os_ghostbsd.png loader /EFI/ghostbsd/BOOTX64.EFI options "rootdev=zfs:NEWPOOLNAME/ROOT/default:&quo...

Thanks Fred. (snip) grub> set root=(hd1,gpt2) chainloader (hd1,gpt1)/efi/boot/BOOTX64-REFIND.EFI boot This is how when you land in grub, to boot rEFIND boot manager and then select which one O/S you want to boot. (snip) Uuuum, it seems that I should have explained my situation in more detail. I have...

I installed 22.08.06 version into an empty external USB disk. No problem encountered. And I copied the zfs partition of the USB to a partition of the built-in hard disk of my PC. How can I boot ghostbsd of just copied zfs on the built-in disk? What I did so far: 1. Copied da0p2(zfs, GhostBSD 22.08.0...