Alright, thanks for all of your input, but I've decided to go ahead and give up on this endeavor of getting the Wifi and LAN module to work on this laptop. During the weekend I did some more research, tried a few more things, but nothing changed. Simply couldn't get things working as they should regardless if I swapped files, used systemd during boot, or booted without systemd. Finally, in frustration and just to make sure that it wasn't some sort of weird hardware defect, I went ahead and used one of my Windows 10 Pro licences on the laptop ... which worked without a hitch. LAN is working, WiFi is working, all of the updates downloaded & installed without a problem, so this time around I have to give kudos to Windows 10.
Such a shame, just couldn't get it done with Linux.
I'll add this much ... I've been using every version of Windows professionally since Windows 3.11 for Workgroups and I switched over to Linux for myself full-time in 2009. It really amazes me how out of all of the previous Windows versions, the Windows 10 Desktop has a very distinct feel & responsiveness to it, not much different from Ubuntu, Mint, or MX Linux (probably others too). There's no doubt in my mind that Microsoft took a long hard look at the guts of Linux, to make Windows 10 perform as it does ... completely different from any other Windows that I've used in the past.
Thanks again for your efforts everyone.
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