I have installed Ubuntu 22.04 under Legacy mode. Many thanks Tea For One!

As for putting the HP back into UEFI mode, I am reluctant about that because their implementation is so bad. So for the rest of the life of this laptop, I will keep it in Legacy mode. I assume new laptops will have better implementations so it will be a lot easier to install to Ubuntu.

Many thanks to the others for the explanations of the advantages of UEFI mode, GPT vs MBR, and the difference between the Ubuntu and Lubuntu installers.

I will set this thread as solved.