/usr/lib/x86_64-linux-gnu/libsaml.so is in libsaml2-dev 2.6.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsaml.so.9.0.1
/usr/lib/x86_64-linux-gnu/libsaml.so.9.0.1