Installing from usb image - Latitude 7450

[whitt]

I have a new latitude 7450 intel core ultra 5, and am booting the x86_minimal usb image and running into trouble.

I had to turn off secure boot - got into the boot menu, and when I hit enter to boot, I see a static unblinking cursor on an otherwise black screen.

I've walked away and gave it well over 20 minutes to see if it was just figuring something out, but no dice.

What have I done wrong?

Thanks!

EDIT - adding another detail: I booted from the admin image and get through the decompression, then to the menu, when I select Gentoo, it gives me the static unblinking cursor for a few seconds, then I get booted directly into Ubuntu...

Help?