Retired sign guy here. I have been successfully plotting vinyl using Inkcut for very occasional projects for a couple of years. When I tried yesterday, communication with the Ioline seems to not be working. I can open plot files in inkcut and send them. I see the data going out when I Monitor jobs. The setup is the same for the plotter. The plotter can run its internal plot test just fine. I reinstalled Inkcut and Python just to check. No luck. Did something change with an Ubuntu Ubuntu 20.04.4 LTS update that may be stopping serial communication?