/usr/lib/python2.7/dist-packages/z3c.template-1.4.1.egg-info/namespace_packages.txt is in python-z3c.template 1.4.1-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/z3c.template-1.4.1.egg-info/../../../../share/pyshared/z3c.template-1.4.1.egg-info/namespace_packages.txt