Hi, I am stuck too with installing any of the 2004 or 2204 ubuntu bfb on my smartNICs. None of them work now, as hang up during a flashing process.
My process actually stopped at the exit Boot Service part, and nothing happened after that, even if leaving the machine up and running for hours.
What is the main host system you use and can you share the exact image path that was working for you?
My issue with screenshots is here