/usr/bin/x86_64-linux-gnu-python-dbg-config is in libpython-dbg 2.7.5-5ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/x86_64-linux-gnu-python2.7-dbg-config
/usr/bin/x86_64-linux-gnu-python2.7-dbg-config