F28 server boots to the grub prompt even after dnf update and grub2-mkconfig

[linux guy <linuxguy123@xxxxxxxxx>]

I have an up to date F28 server that boots to the grub prompt.   This started after a failed dnf update.

The computer will boot to an emergency mode command prompt if I set it up properly from the grub prompt.  

grub> set root=(lvm/fedora-root)

grub> linuxefi (hd0,gpt2)/vmlinuz-0-rescue... root=/dev/mapper/fedora-root
grub>initrdefi (hd0,gpt2)/initramfs-0-rescue....img
grub>boot

I can get networking working

#ls /sys/call/net   <- find Ethernet device is enp3s0

# ifup enp3s0

# ping www.google.com

Now update it

# dnf update

Regenerate the grub2 config file

# grub2-mkconfig

Reboot

# shutdown -r now

It still boots to the grub prompt.

Why does it boot to the grub prompt and what do I need to do to fix it ? 

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