/usr/lib/python3/ is in python3-update-manager 1:16.04.12.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/
/usr/lib/python3/dist-packages/UpdateManager/
/usr/lib/python3/dist-packages/UpdateManager/Core/
/usr/lib/python3/dist-packages/UpdateManager/Core/utils.py
/usr/lib/python3/dist-packages/UpdateManager/Core/MyCache.py
/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py
/usr/lib/python3/dist-packages/UpdateManager/Core/UpdateList.py
/usr/lib/python3/dist-packages/UpdateManager/Core/AlertWatcher.py
/usr/lib/python3/dist-packages/UpdateManager/Core/roam.py
/usr/lib/python3/dist-packages/UpdateManager/Core/__init__.py
/usr/lib/python3/dist-packages/UpdateManager/backend/
/usr/lib/python3/dist-packages/UpdateManager/backend/InstallBackendAptdaemon.py
/usr/lib/python3/dist-packages/UpdateManager/backend/InstallBackendSynaptic.py
/usr/lib/python3/dist-packages/UpdateManager/backend/__init__.py
/usr/lib/python3/dist-packages/UpdateManager/UnitySupport.py
/usr/lib/python3/dist-packages/UpdateManager/UpdateManagerVersion.py
/usr/lib/python3/dist-packages/UpdateManager/__init__.py
/usr/lib/python3/dist-packages/janitor/
/usr/lib/python3/dist-packages/janitor/plugincore/
/usr/lib/python3/dist-packages/janitor/plugincore/plugin.py
/usr/lib/python3/dist-packages/janitor/plugincore/manager.py
/usr/lib/python3/dist-packages/janitor/plugincore/cruft.py
/usr/lib/python3/dist-packages/janitor/plugincore/exceptions.py
/usr/lib/python3/dist-packages/janitor/plugincore/i18n.py
/usr/lib/python3/dist-packages/janitor/plugincore/__init__.py
/usr/lib/python3/dist-packages/janitor/__init__.py