/usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls/qmldir is in qml-module-qtquick-controls 5.5.1-1ubuntu1.
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 | module QtQuick.Controls
plugin qtquickcontrolsplugin
classname QtQuickControlsPlugin
typeinfo plugins.qmltypes
designersupported
depends QtQuick.Window 2.2
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