When I upgraded to Ubuntu 18.04 it automatically installed version 3.0.8. I did have 2.2.4 in 16.04. I still use 2.2.8 on my Windows 8.1 machine. I had tried upgrading on it & nothing above Weatherwax was compatible with my video driver. I had no problem downgrading back.
I am having numerous problems with Vetinari on Ubuntu. Sometimes when changing episodes, even in the same series the video effects completely change. The screen gets very bright & I have to tweak it all over again. Weatherwax did not have a save button on the effects. I just stayed the same unless you changed it. Unchecking adjust image is not an option. In either version it is too dark.
3.0.8 is buggy. Sometimes if you jump ahead or back either with the mouse wheel or or hotkeys, it freezes & then closes. When using the mouse wheel it moves very slow & sluggish compared to Weatherwax. Sometimes when changing episodes, it plays a few seconds & then changes again. I go back to the one it cut out on & then it plays with no problem.
I am pretty much a Linux newbie. A friend installed Ubuntu for me & set it up to be more "user friendly" for a Windows user. I have lost contact with him. It seems the only way to install a program is to either use the Ubuntu software center or the command prompt. You tell it to get an app & it will only install the latest version if it works for me at all. If it's not in the software center I am sometimes just out of luck.