Russ

Yes, though I think the exception is (some?) ARM based PCs don’t run UEFI, in which ARM in general doesn’t have a universal standard for booting which adds complexity to it. Perhaps that’s already changed though, I haven’t kept up too well in the ARM space.

Not sure if maybe the Walmart self checkout terminals aren’t x86 machines, perhaps they’re ARM or another embedded type of system.

For what its worth, I know that while a lot of the hardcore Linux community seems to absolutely despise Ubuntu/Canonical because of snaps and whatnot, I don’t think there is anything actually wrong with using Ubuntu if that is what works for you. Use the best tool for the job!