/usr/lib/python3.5/config-3.5m-x86_64-linux-gnu/libpython3.5m.so is in libpython3.5 3.5.1-10.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python3.5/config-3.5m-x86_64-linux-gnu/../../x86_64-linux-gnu/libpython3.5m.so.1