Do people really say Youbuntu? Or is it just this one colleague?

No, must be cancers

The question I always had but never knew!!

Yes they do ! Some of them 😫

So it’s “ew bun two” ?

Only psychopaths

I say You-bun-tu.

I'm not a cancer.
Can neither confirm nor deny on being a psychopath.

A lot of words in English that start with 'u' are pronounced as 'you'.
E.g.
Use
User
Unique
University
Universal
Uber
etcetera.

and hence You-bun-tu.

@gsn16 but ubuntu is african tho

@gsn16 they are good examples. But Uber!!! No way do you say You-ber 😅

oo-ber
oo-boon-too