/usr/lib/libgdamm-5.0.so.13 is in libgdamm-5.0-13 4.99.6-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libgdamm-5.0.so.13.0.0
/usr/lib/libgdamm-5.0.so.13.0.0