/usr/lib/python3/dist-packages/matplotlib/backends/web_backend/jquery/js/jquery-1.7.1.min.js is in python3-matplotlib 1.5.1-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python3/dist-packages/matplotlib/backends/web_backend/jquery/js/../../../../../../../../share/javascript/jquery/jquery.min.js