/usr/lib/python2.7/dist-packages/z3c.rml-2.0.0-nspkg.pth is in python-z3c.rml 2.0.0-0ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/../../../share/pyshared/z3c.rml-2.0.0-nspkg.pth