/usr/lib/x86_64-linux-gnu/pkgconfig/python-dbg.pc is in python-dbg 2.7.13-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/pkgconfig/python-2.7-dbg.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/python-2.7-dbg.pc