/lib/x86_64-linux-gnu/libnih-dbus.so is in libnih-dbus-dev 1.0.3-6ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /lib/x86_64-linux-gnu/libnih-dbus.so.1.0.0
/lib/x86_64-linux-gnu/libnih-dbus.so.1.0.0