I'm not doubting your specific experiences, but I set up a Flask project with Python 3 on an Ubuntu system myself about three months ago, and - as someone with

I'm not doubting your specific experiences, but I set up a Flask project with Python 3 on an Ubuntu system myself about three months ago, and - as someone with a lot of experience with Linux and Ruby (and other things) but relatively little with Python - I didn't have much trouble. It definitely could have been easier, and I think I did have to google a few incantations to make it all work, but it didn't seem terribly hacky or messy to me, and probably no worse than getting the equivalent Ruby/rvm/Sinatra project to work. (Other comments suggest that there are fundamental problems with Python and virtualenv and Ubuntu, so either I just fortuitously missed all of that or maybe I was in such a happy delirium of tinkering that I've now forgotten all about it.)