Yeah… this feels like a very bad example. I am honestly curious as to specifics here, because Ubuntu setup is pretty dead simple with the graphical installer. And like you said docker is native linux.

Saying running anything out of the box is “impossible by design” on Ubuntu is objectively wrong frankly. Maybe you could argue they haven’t succeeded in their goal of being super out of the box friendly, not sure I’d agree but at least you’d have leg to stand on.