5.8 Install claims to work but get grub prompt on boot

[WytWun]

I perform a standard install from a USB Image to a small Intel NUC box (8GB memory, couple of CPUs) and when it completes its reboot,and goes back to BIOS, I remove the memory stick and I get the grub prompt.

The first part of this post may be helpful, particularly the grub recovery link.

Ignore the "Observations:" section of that posting as that is unrelated to the grub issue.