I'm not sure about that. Even wealthy countries can have water problems in times of drought. I grew up during the Millennium Drought in Australia, we had major water restrictions and major campaigns to try to get people to do things like take shorter showers. https://en.m.wikipedia.org/wiki/2000s_Australian_drought
And that's in a wealthy nation with well-developed infrastructure. Countless places around the world have neither of those, and I'm sure lots of people in those places would love the luxury of a long shower without wasting water.
Definitely, I don't really like Ubuntu that much even though it's my go-to. What I like is Xfce. Whether I get it via xubuntu or something else I don't really care.