I'm not sure exactly where your system is stopping, but I just went
through an issue moving a system yesterday, so maybe this will help.

If your system is booting in UEFI mode (running "efibootmgr" shows boot
entires), there's an extra file that needs to be updated that I don't
think is clearly documented anywhere, nor is there a command to updated
it.  That is /boot/efi/EFI/fedora/grub.cfg.  It searches for the /boot
partition by UUID.

To find the correct UUID, I believe this will work:

- boot a Live image from USB
- select Troubleshooting at the boot menu and choose Rescue
- at the prompt, choose to mount the system
- in the shell, run: chroot /mnt/sysimage
- find the correct UUID with: lsblk -o UUID,MOUNTPOINT | grep ' /boot$'
- edit /boot/efi/EFI/fedora/grub.cfg and put that UUID on the "search" line

I'm not sure that this is clearly documented anywhere, and I don't think
there's any command to update that file easily (unlike regenerating the
main grub.cfg with "grub2-mkconfig -o /etc/grub2.cfg").
-- 
Chris Adams <li...@cmadams.net>
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