/usr/lib/libmilter/libmilter.so.1.0.1 is in libmilter-dev 8.14.4-4.1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libmilter/../libmilter.so.1.0.1
/usr/lib/libmilter/../libmilter.so.1.0.1