/usr/lib/python2.7/dist-packages/zope/formlib/errors.txt is in python-zope.formlib 4.0.5-0ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/zope/formlib/../../../../../share/pyshared/zope/formlib/errors.txt