I finally got it working. Agreed its an older version, we are a little limited due to Vendor older product. The solution was : (1) Update to Ubuntu kernel 5.4.0-150-generic (2) sudo apt-get update (3) sudo apt-get install linux-modules-extra-5.4.0-150-generic Then I plugged in the USB GPS device, it found it, mounted /dev/ttyUSB0 and off it went. Seems even though I was running 5.4.0-84-generic previously, it seems the -84 version it wasnt quite good enough to handle the USB serial properly. Thanks everyone for your help.