/usr/lib/x86_64-linux-gnu/libnm-gtk.so.0 is in libnm-gtk0 1.2.6-0ubuntu0.16.04.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libnm-gtk.so.0.0.0
/usr/lib/x86_64-linux-gnu/libnm-gtk.so.0.0.0