/usr/lib/x86_64-linux-gnu/libloudmouth-1.so is in libloudmouth1-dev 1.5.3-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libloudmouth-1.so.0.1.0
/usr/lib/x86_64-linux-gnu/libloudmouth-1.so.0.1.0