/usr/lib/x86_64-linux-gnu/libsubunit.so.0 is in libsubunit0 0.0.18-0ubuntu7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsubunit.so.0.0.0
/usr/lib/x86_64-linux-gnu/libsubunit.so.0.0.0