/usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Components/Themes/qmldir is in ubuntu-ui-toolkit-theme 1.3.1918+16.04.20160404-0ubuntu1.
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 | module Ubuntu.Components.Themes
Palette 0.1 ./1.2/Palette.qml
PaletteValues 0.1 ./1.2/PaletteValues.qml
#version 1.3
Palette 1.3 ./1.3/Palette.qml
PaletteValues 1.3 ./1.3/PaletteValues.qml
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