/usr/lib/python2.6/dist-packages/twisted/plugins/carbon_aggregator_plugin.py is in graphite-carbon 0.9.10-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.6/dist-packages/twisted/plugins/../../../../../share/pyshared/twisted/plugins/carbon_aggregator_plugin.py