On Thursday October 05 2017 22:54:11 Aleksey Midenkov wrote: >QT_QPA_PLATFORMTHEME="qt5ct" qt5ct --> https://sourceforge.net/projects/qt5ct/ That's an interesting discovery, thanks for that. But what kind of desktop do you use? You shouldn't be needing this if you're using a full-blown KDE/Plasma desktop environment. Qt5ct seems to be a generic alternative to the plasma-integration plugin. If you're not using a Plasma desktop but still have the framework-integration framework as well as the plasma-integration plugin installed you can also do export KDE_SESSION_VERSION=5 (4 also works) export KDE_FULL_SESSION=true export QT_QPQ_PLATFORMTHEME=kde R.