[GTALUG] Problem with /dev/ttyUSB* serial port

[Jim Ruxton via talk]

I have a device plugged into an active USB extender that usually shows 
up as /dev/ttyUSB0 when I first plug it in (occasionally it will show up 
as /dev/ttyUSB1 when first plugging it in) . If it is /dev/ttyUSB0 when 
I unplug it and plug it back in it occasionally changes to /dev/ttyUSB1 
. Is there a way that I can always have it show up as /dev/ttyUSB0 . I'm 
not sure why /dev/ttyUSB0 isn't being released and restarted after 
unplugging and replugging it. If I look in /dev it does disappear as 
/dev/ttyUSB0 from there when I unplug it but like I said it reappears as 
/dev/ttyUSB1? I am on Ubuntu 18.04.3 LTS .

Thanks for any pointers.
Jim

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