/usr/lib/gcc/x86_64-linux-gnu/5/plugin/python3_dbg/gccutils is in gcc-python3-dbg-plugin 0.15-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gcc/x86_64-linux-gnu/5/plugin/python3_dbg/../../../../../python3/dist-packages/gccutils