If your goal is to dual boot, i might not be able to help you.  If you're trying to just set up a bare-metal crux system, your grub install process must be wonky, though, all I do is:
(appropriate fstab changes)
grub-install /dev/sda
(compile kernel, make modules_install, make firmware_install, cp System.map /boot/, cp arch/x86/boot/bzimage /boot/vmlinuz-1)
grub-mkconfig > /boot/grub/grub.cfg
reboot

I don't think I'm missing anything critical there as far as just being able to boot is concerned...

On Fri, Jan 27, 2017 at 12:07 PM, Milton Smith <miltonsj@gmail.com> wrote:
I am using grub in Ubuntu because when I install grub in CRUX, I reboot to a grub rescue prompt and not a grub menu. It is very inconvenient. The UUID in stab just takes the place of where you put /dev/sdb, etc. Does that help clear it up? Thanks

On Fri, Jan 27, 2017 at 10:56 AM, Steve Volumetric <volumetricsteve@gmail.com> wrote:
How or more importantly why are you using Ubuntu's grub2 in crux?
Is it an EFI system?  I'm not sure what you mean by UUID in the context of fstab, I almost always have something like:

/dev/sdb1   /    ext4   defaults,noatime(or whatever)   0   1

I wouldn't recommend using utilities for a different distrobution, crux comes with grub2.

-vsteve

On Fri, Jan 27, 2017 at 11:42 AM, Milton Smith <miltonsj@gmail.com> wrote:
I am trying to boot from the Grub that comes standard with an Ubuntu installation. I am installing on bare metal. I did compile my root filesystem into the kernel. I am using ext4. I did setup fstab with the uuid of the CRUX partition. Sorry for the confusion.

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On Jan 27, 2017, at 9:55 AM, Steve Volumetric <volumetricsteve@gmail.com> wrote:
I have a few questions, but first, what is "ubuntu grub2"?  Are you installing on a VM or bare metal?
Did you compile your root file system into your kernel?  What file system are you using on your root file system?  Did you set up fstab?

-vsteve

On Fri, Jan 27, 2017 at 10:46 AM, Milton Smith <miltonsj@gmail.com> wrote:
Everytime I try to boot CRUX from Ubuntu's Grub2 it fails with a kernel panic.

It gives me the error message, " unable to mount root filesystem on unknown block (0,0)".

Can someone help me with this? Thanks!

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Milton Smith