/usr/lib/python2.7/dist-packages/hgext/largefiles/ is in mercurial-common 4.5.3-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/hgext/largefiles/__init__.py
/usr/lib/python2.7/dist-packages/hgext/largefiles/basestore.py
/usr/lib/python2.7/dist-packages/hgext/largefiles/lfcommands.py
/usr/lib/python2.7/dist-packages/hgext/largefiles/lfutil.py
/usr/lib/python2.7/dist-packages/hgext/largefiles/localstore.py
/usr/lib/python2.7/dist-packages/hgext/largefiles/overrides.py
/usr/lib/python2.7/dist-packages/hgext/largefiles/proto.py
/usr/lib/python2.7/dist-packages/hgext/largefiles/remotestore.py
/usr/lib/python2.7/dist-packages/hgext/largefiles/reposetup.py
/usr/lib/python2.7/dist-packages/hgext/largefiles/storefactory.py
/usr/lib/python2.7/dist-packages/hgext/largefiles/uisetup.py
/usr/lib/python2.7/dist-packages/hgext/largefiles/wirestore.py