Ubuntu works great, i just installed it in a VM and it told me i can use "Ubuntu Software" to install new applications - i opened that and it was completely empty for a few seconds until images started to appear.
Then i went to games which was empty and nothing would appear. I closed it and started it again and now games would show up, so i decided to install "WolfeDoom" which sounded interesting. While it was downloading, i went back and decided to also install ZZT (i think) so i pressed Install for that too. That installed fast so i tried to run it and... nothing happened. I tried again, but nothing - the game's name appeared for a bit at the top but then disappeared without any indication about what was wrong. So i uninstalled it and closed the Software app.
At this point i thought to try WolfenDoom but... i couldn't find it anywhere. I opened the Software app to see where it was, went to the installed tab, scrolled down and found it, but instead of "Launch" (or whatever) it had an "Install" button next to it (which is weird since i was in the installed category). I clicked it and an error popped up about some state or whatever. So i restarted the Software app, went directly to the game's page and pressed Install from there - error again. So i googled to figure out what is wrong and i found vague messages about it.
Eventually it fixed itself. Somehow. My guess it was installing at the background but this wasn't shown anywhere and trying to install it again was failing because of that.
Very usable.
Very just works.