I have a little kingdel box that has 5 actual, 9 pin serial ports. I am working with arduino and need my active usb port to show up as a com port, but it doesn't. 

ls /dev/tty* does not list any usb devices. Is there a way to make the usb port a com port in this case? 

Ubuntu 18.04.3 LTS 

Raymond Norton 
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