Hey, everybody, thanks for all the replies.
It sounds like Fedora is working on the problem, but isn't there yet.
Hopefully by the time I assemble my next computer for my own use
near the end of next year (replacing the one I've had since 2009),
the UEFI problem will be a thing of the past.
Meanwhile, I guess I'll have to return this box to Office Depot and
order one with Linux pre-installed from System 76, Ohava, or
ThinkPenguin.
It's a shame, because I've been a happy HP user for many, many
years. Back when I bought calculators, I always got them from HP
and was happy with them. I have fond memories of HP's DEM2 computer,
which had a 32-Mb hard disk with four 8-Mb partitions and CP/M 2.2
installed on each partition, which allowed you to set up each partition
for a given set of tasks and choose which one to boot from when you
turned on the computer. It also came with Spellbinder, not Word Star!
When I moved from dot-matrix printers, I used a trusty LaserJet+
for many years. Since then, I've used a series of HP InkJets. For
scanners, I've never had any problem with HP scanners (except that
they work better under Windows than Linux, because HP won't
release the necessary information to the Linux world).
But I guess it's time to tell HP all this, and tell them I won't be
buying future products until they quit the Evil Empire.
Got to send a complaint to the Anti-Trust division and look into
starting (or joining) a class-action lawsuit, too. But first I have
to get mom her e-mail back!
Anyway, thanks for all the advice. You guys are the greatest.
-- Leo David Orionis