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Running an HP Z 800 for some months. Recently installed a newer version of Ubuntu 20.04 LTS OS and got it running etc. Today, at an attempted boot-up, it runs up to the screen in the images below. I cannot tell what I need to do about this, I don't understand what the screen is all about.
When the screen below first appears there is another bit offering two selections. F1 or F2.
This first image below gives a good look at the details of the screen.
The second image shows choices F1 or F2 offered when the screen first comes up. The selections disappear in a very few seconds but the screen remains... Seems no way to proceed short of hitting the power button.
Pressing F1 seems to do nothing. Pressing F2 shows some activity on the screen, but it quits in a few seconds.
No indication of what to do or etc. What problem is this screen showing me? What to do about it?
Here is a close up of all the details:
This image below shows the selections that are presented for a few moments
