/usr/lib/python2.7/dist-packages/paste/evalexception/media/MochiKit.packed.js is in python-paste 2.0.3+dfsg-4ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/paste/evalexception/media/../../../../../../share/javascript/mochikit/MochiKit.js