My dad is a complete tech noob. I took his laptop, installed Ubuntu, configured everything and showed him where he could find the applications he uses. Done.

Now get in the white van.

You know what gets ppl to use Linux? 100% Software compatibility out of the box and OEM who preinstall Linux distros.

Barely anyone outside the bubble oft techies and enthusiasts cares. You have to BRING it to the users. For most oft them comfort is king after all.

Honestly, when it comes to your specified amount of Cores & RAM you’ll have tough luck. Got myself a MiniPC with 5700U and 32GB of RAM, two 1TB SSDs (mirrored) and 3 NIC but that was still 500€ after waiting for a decent deal.

Even buying a used PC off eBay will most likely cost far more if you insist on your specs.