/usr/share/doc/python-vigra/rst is in python-vigra-doc 1.7.1+dfsg1-2ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/python-vigra/../python-vigra-doc/rst
/usr/share/doc/python-vigra/../python-vigra-doc/rst