/usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Components/Themes/SuruGradient/parent_theme 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 | Ubuntu.Components.Themes.Ambiance
|