/usr/lib/x86_64-linux-gnu/liblouisxml.so.1 is in liblouisxml1 2.4.0-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/liblouisxml.so.1.2.0
/usr/lib/x86_64-linux-gnu/liblouisxml.so.1.2.0