/usr/lib/x86_64-linux-gnu/python2.7/site-packages/vtk is in python-vtk6 6.2.0+dfsg1-10build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/python2.7/site-packages/../../../python2.7/dist/packages/vtk