The Nav2 is a modular robotics platform created by Crosswing Inc, consisting of an omniwheel holonomic mobile base and interchangeable upper components. The Nav2's base configuration is that of a telepresence robot, the VirtualMe (pictured).
You can install the Nav2 software on the control computer via apt-get:
sudo apt-get install ros-hydro-nav2-platform
To operate the mobile base, you must connect your control computer to the Nav2's control board, located in the lower compartment. The board can be networked with using a variety of configurations such as static IP, or DHCP with zeroconf DNS (e.g. avahi).
Once connected, you can start the appropriate launch file in the nav2_platform stack to begin controlling the base. Please see the stack documentation for details.