/usr/lib/python2.7/dist-packages/zope/index/field/README.txt is in python-zope.index 3.6.4-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/zope/index/field/../../../../../../share/pyshared/zope/index/field/README.txt