Comment 5 for bug 1853906

I've discovered that adjusting some firmware options caused the system to deploy normally. Specifically, I adjusted the settings of some PCI devices to favor EFI-mode vs. BIOS-mode device firmware. The warnings noted in my initial bug report still appear on the screen for a few seconds, but the computer now moves past them.

I still think that the fallback (EFI\BOOT\bootx64.efi) boot path should either work (which it does not without a matching EFI\BOOT\grubx64.efi binary) or it should be completely absent. Thus, I believe this is still a bug, albeit one that's being worked around by my modified firmware settings.