I was having a ton of issues with the style of KDE when installing kubuntu-desktop on 16.04, including this bug.
Adding "QT_QPA_PLATFORMTHEME=kde" to my .profile solved a lot of them.
Found that from here: http://askubuntu.com/questions/633097/kubuntu-15-04-plasma-5-3-showing-kde-apps-with-gtk-themes https://forum.kde.org/viewtopic.php?f=289&t=124931
I was having a ton of issues with the style of KDE when installing kubuntu-desktop on 16.04, including this bug.
Adding "QT_QPA_ PLATFORMTHEME= kde" to my .profile solved a lot of them.
Found that from here: askubuntu. com/questions/ 633097/ kubuntu- 15-04-plasma- 5-3-showing- kde-apps- with-gtk- themes /forum. kde.org/ viewtopic. php?f=289& t=124931
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