How to dual boot with a Linux distro?

ron

As the title states, how to set up a dual boot with a Linux distro? I've been trying for days but can't get it. I installed GhostBSD first, then Linux distros, but I can't get grub to find GhostBSD. Any suggestions?

ron

Should have put this in the original post. I've tried every combination of the following added to the /etc/grub.d/40_custom file but it just doesn't work:

menuentry "GhostBSD" {
set root=(hd0,gpt2) # Adjust according to your setup
kfreebsd /boot/loader}

vpx

Ideally you should have installed the reFIND boot manager during the setup:

https://ghostbsd-documentation-portal.readthedocs.io/en/latest/user/installation-guide/full-disk-installation.html#boot-loader

But you can still install the package ghostbsd-refind later.

As you don't get into GhostBSD in the first place, you're only left with the GRUB2 loader.

It doesn't seem to be that trivial to boot FreeBSD from GRUB2, see this thread: https://forums.freebsd.org/threads/is-it-possible-to-boot-freebsd-14-2-uefi-zfs-gpt-using-grub2-efi.96943/

But you can try the method presented here: https://unix.stackexchange.com/questions/480829/how-to-create-a-grub-entry-for-a-freebsd-on-zfs-installation

ron

vpx Ideally you should have installed the reFIND boot manager during the setup:

I can't use refind because this is a legacy boot (I should have mentioned that in the original post, sorry). I tried the answer given in the stackexchange link you gave but when trying to boot I got this message:

error: no such device: zroot.
error: file `/@/boot/zfsloader' not found.
error: you need to load the kernel first.

Any ideas?

vpx

You could try using Super Grub2 Disk which is mentioned here to find out the correct entry.

Although I don't see the ZFS file system on his screenshots.

ron

I'm afraid I'm just going to throw in the towel. I never heard of SuperGrub2 Disc before . . . and I'm leery of installing things outside of OS's repos. But thanks for your help.

vpx

You don't have to install anything you just have to create an IMG or ISO boot disk.