Comment 3 for bug 1789113

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Daniel Schürmann (daschuer) wrote : Re: 2.3-alpha no gnome theme in preferences

This workaround works for me:

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

I am not sure if ubuntu thinks every user should do this to have nice looking Qt5 apps.
I will ask.