/usr/lib/x86_64-linux-gnu/libnm-glib.so.4 is in libnm-glib4 1.2.6-0ubuntu0.16.04.3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libnm-glib.so.4.9.0
/usr/lib/x86_64-linux-gnu/libnm-glib.so.4.9.0