/dev/ttyUSB* missing from Ubuntu host

Connected Ubuntu 16.04 to PX2 USB 2.0 Debug port using USB A - A cable provided by Nvidia, believe cable is identical to :

       https://www.amazon.com/gp/product/B004TXPWV6/ref=ask_ql_qh_dp_hza

Enter command “ls /dev/ttyUSB*”, which should show 8 USB devices, but none show up.

What is required to create /dev/ttyUSB* on host Ubuntu?

Thanks.

P.S. TegraA and B have factory installed firmware images.