/usr/ is in command-not-found 0.2.46ubuntu6.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/command-not-found/
/usr/share/command-not-found/data/
/usr/share/doc/
/usr/share/doc/command-not-found/
/usr/share/doc/command-not-found/README
/usr/share/doc/command-not-found/copyright
/usr/share/pyshared/
/usr/share/pyshared/CommandNotFound/
/usr/share/pyshared/CommandNotFound/__init__.py
/usr/share/pyshared/CommandNotFound/CommandNotFound.py
/usr/share/pyshared/CommandNotFound/util.py
/usr/share/pyshared/command_not_found-0.2.44.egg-info
/usr/lib/
/usr/lib/python2.7/
/usr/lib/python2.7/dist-packages/
/usr/lib/python2.7/dist-packages/CommandNotFound/
/usr/lib/command-not-found
/usr/share/doc/command-not-found/changelog.gz
/usr/lib/python2.7/dist-packages/CommandNotFound/__init__.py
/usr/lib/python2.7/dist-packages/CommandNotFound/CommandNotFound.py
/usr/lib/python2.7/dist-packages/CommandNotFound/util.py
/usr/lib/python2.7/dist-packages/command_not_found-0.2.44.egg-info