/usr/lib/x86_64-linux-gnu/libnm-glib.so is in libnm-glib-dev 0.9.8.8-0ubuntu7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libnm-glib.so.4.6.0
/usr/lib/x86_64-linux-gnu/libnm-glib.so.4.6.0