Don't have the whole answer but take a look here about Ubuntu & coreboot:

https://www.coreboot.org/Lesson1

On Mon, Aug 31, 2020 at 2:22 AM Ale via coreboot <coreboot@coreboot.org> wrote:
Hello,
I have an Asus KGPE-D16 motherboard, is it possible, as far as you know, to flash coreboot with the internal method, i.e. using flashrom on Ubuntu/Debian?
Moreover I would like to know if is possible to download the coreboot.rom from anywhere (maybe with seabios included)

Thank you very much!
Best regards
Alessio
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