/usr/lib/python2.7/config-x86_64-linux-gnu_d/libpython2.7_d.so is in libpython2.7-dbg 2.7.6-8ubuntu0.5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/config-x86_64-linux-gnu_d/../../x86_64-linux-gnu/libpython2.7_d.so