/usr/lib/x86_64-linux-gnu/liblightdm-gobject-1.so.0 is in liblightdm-gobject-1-0 1.18.3-0ubuntu1.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/liblightdm-gobject-1.so.0.0.0