/usr/share/invesalius/invesalius/gui/ is in invesalius 3.1.1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/invesalius/invesalius/gui/__init__.py
/usr/share/invesalius/invesalius/gui/bitmap_preview_panel.py
/usr/share/invesalius/invesalius/gui/data_notebook.py
/usr/share/invesalius/invesalius/gui/default_tasks.py
/usr/share/invesalius/invesalius/gui/default_viewers.py
/usr/share/invesalius/invesalius/gui/dialogs.py
/usr/share/invesalius/invesalius/gui/dicom_preview_panel.py
/usr/share/invesalius/invesalius/gui/frame.py
/usr/share/invesalius/invesalius/gui/import_bitmap_panel.py
/usr/share/invesalius/invesalius/gui/import_network_panel.py
/usr/share/invesalius/invesalius/gui/import_panel.py
/usr/share/invesalius/invesalius/gui/language_dialog.py
/usr/share/invesalius/invesalius/gui/preferences.py
/usr/share/invesalius/invesalius/gui/task_exporter.py
/usr/share/invesalius/invesalius/gui/task_generic.py
/usr/share/invesalius/invesalius/gui/task_importer.py
/usr/share/invesalius/invesalius/gui/task_navigator.py
/usr/share/invesalius/invesalius/gui/task_slice.py
/usr/share/invesalius/invesalius/gui/task_surface.py
/usr/share/invesalius/invesalius/gui/task_tools.py
/usr/share/invesalius/invesalius/gui/widgets/
/usr/share/invesalius/invesalius/gui/widgets/__init__.py
/usr/share/invesalius/invesalius/gui/widgets/clut_imagedata.py
/usr/share/invesalius/invesalius/gui/widgets/clut_raycasting.py
/usr/share/invesalius/invesalius/gui/widgets/gradient.py
/usr/share/invesalius/invesalius/gui/widgets/listctrl.py
/usr/share/invesalius/invesalius/gui/widgets/slice_menu.py