Great question — answering as the UphillTech team:
Alright, so I spent a large amount of time over the weekend monkeying around between Google and my installed Ubuntu. Eventually, I managed to get it to work. Now since I tried so many different things it is hard to say in a concise way exactly what I did that fixed the issue, but I can lay out what I observed. Basically, good old (ancient) HP, has a tendency to not recognize a new linux OS. So, generally, the first thing to do is to go into the firmware (UEFI) and tick the check mark to enable UEFI mode. With the particular computer I was using I was able to set the rest of the firmware settings to factory default. With that out of the way, you can plug in your bootable drive (I used Balena...
Full answer by HyponoxIV: https://askubuntu.stackexchange.com/a/1569756 (CC BY-SA 4.0).
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