Cura LE Version: 3.6.18
Operating System: Ubuntu 18.04.3 LTS
Printer: TAZ 5
Tool Head: Dual V3
Description of issue: When using Cura and the USB port /dev/ttyUSB0 for instance does not allow any access Cura is simply crashing.
Steps to reproduce: Start Cura with a printer attached to a USB port as a standard user and try to access the USB port with write commands.
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