/usr/lib/x86_64-linux-gnu/samba/libroken-samba4.so.19 is in samba-libs 2:4.7.6+dfsg~ubuntu-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/samba/libroken-samba4.so.19.0.1