As I’ve already explained to you elsewhere, that’s not how this works.
So you say…
You are the one who made the claim. The burden is on you to provide a good backing for said claim.
I have no burden to provide anything but I did anyway out of courtesy, you and your friends just refuse that out of gut feeling.
Personally, I’m not sure if good enough data to provide an answer to everyone’s satisfaction exists.
So there is, according to your own words, absolutely no credible evidence that Ubuntu is popular on desktops at all. So everybody here claiming how popular Ubuntu is, is making claims without backing them up. Funny how your fervor isn’t with them and their “burden to provide a good backing for said claim”. Seems you are not that objective about that matter.
Fact is, Steam is widely used by “regular” people (which this sub-thread is about) and therefore the best statistic there is about distribution usage outside the “techie sphere”.
So you are “not sure if good enough data to provide an answer to everyone’s satisfaction exists” that Ubuntu is popular and the statistic that exists says it isn’t that popular among non-techie users. Good that we have this settled now!