/usr/share/kubuntu-default-settings/settings.ini is in kubuntu-settings-desktop 1:14.04ubuntu15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | [Settings]
gtk-font-name=Ubuntu 9
gtk-theme-name=oxygen-gtk
gtk-icon-theme-name= oxygen
gtk-fallback-icon-theme=gnome
gtk-toolbar-style=GTK_TOOLBAR_ICONS
gtk-menu-images=1
gtk-button-images=1
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