/usr/lib/ is in python-egenix-mxqueue 3.2.1-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/
/usr/lib/python2.7/dist-packages/
/usr/lib/python2.7/dist-packages/mx/
/usr/lib/python2.7/dist-packages/mx/Queue/
/usr/lib/python2.7/dist-packages/mx/Queue/mxQueue/
/usr/lib/python2.7/dist-packages/mx/Queue/mxQueue/mxQueue.so
/usr/lib/pyshared/
/usr/lib/pyshared/python2.7/
/usr/lib/pyshared/python2.7/mx/
/usr/lib/pyshared/python2.7/mx/Queue/
/usr/lib/pyshared/python2.7/mx/Queue/mxQueue/
/usr/lib/python2.7/dist-packages/mx/Queue/mxQueue/__init__.py
/usr/lib/python2.7/dist-packages/mx/Queue/mxQueue/test.py
/usr/lib/python2.7/dist-packages/mx/Queue/UserQueue.py
/usr/lib/python2.7/dist-packages/mx/Queue/__init__.py
/usr/lib/python2.7/dist-packages/mx/Queue/queuebench.py
/usr/lib/pyshared/python2.7/mx/Queue/mxQueue/mxQueue.so