I am using Kubuntu 12.04 and QtCurve widget style which does not support GTK3:
How can apply a GNOME theme for GTK3 apps?
I found an advice here: installed gnome-themes-standard
and gnome-themes-extras
packages, created file ~/.config/gtk-3.0/settings.ini
:
[Settings]
gtk-theme-name = Adwaita
gtk-fallback-icon-theme = gnome
But this didn't help.