Comment 16 for bug 1695618

This workaround works for me:

sudo apt install qt5-style-plugins
echo "export QT_QPA_PLATFORMTHEME=gtk2" >> ~/.profile

Not fixing this bug in Ubuntu means that all QT5 Applications will looks 80s.
https://bugs.launchpad.net/mixxx/+bug/1789113

Effected Apps are qBittorrent VLC Virtualbox Mixxx ...

In the Mixxx project, we like to offer our user the best experience and polished view.
Hacking magic commands to the terminal should not be a part of that.
I think we can also not add that to our install scripts because of the different ubuntu flavours.

Do you have any ideas what can be the solution to fix this regression?