/usr/lib/ is in ubiquity-frontend-kde 2.18.7.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ubiquity/
/usr/lib/ubiquity/ubiquity/
/usr/lib/ubiquity/ubiquity/frontend/
/usr/lib/ubiquity/ubiquity/frontend/kde_components/
/usr/lib/ubiquity/ubiquity/frontend/kde_components/PartitionBar.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/Timezone.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/PartAuto.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/ProgressDialog.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/Spinner.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/PartitionModel.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/qssutils.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/nmwidgets.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/Keyboard.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/testing/
/usr/lib/ubiquity/ubiquity/frontend/kde_components/testing/timezonemap.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/testing/partauto.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/testing/partman.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/testing/partitionbar.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/PartMan.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/__init__.py
/usr/lib/ubiquity/ubiquity/frontend/kde_components/Breadcrumb.py
/usr/lib/ubiquity/ubiquity/frontend/kde_ui.py