/usr/lib/x86_64-linux-gnu/libpcl_ml.so.1.8 is in libpcl-ml1.8 1.8.1+dfsg1-2ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpcl_ml.so.1.8.1
/usr/lib/x86_64-linux-gnu/libpcl_ml.so.1.8.1