Trouble opening comport on Linux

[omanthey]

Hello there,

I'm just starting fiddling around with jSerialComm, so maybe I'm just too stupid ;-)

When trying to open a comport aftergetting the array of comports via SerialPort.getCommPorts() I get the LastErrorCode 13 and the LastErrorLocation 519. I'm working on a Linux Mint 20.2 machine and have set the userrights according to the troubleshooting Wiki.

My comport is an USB to RS232 Adapter and the comport is recognized by the system and shown in the comport-array.

Are there any hints what may be wrong?

P.S. When running as root everything is fine ...

[akuhtz]

Hello,
I have seen this on Linux Mint before and change the permission solved the issue for me:
sudo chmod a+rw /dev/ttyUSB0
... replace ttyUSB0 with your device.

[omanthey]

Strange behaviour ... I once called the allowElevatedPermissionsRequest() method and since then everything is running. Even restarting my machine does not lead to the mentioned problems ...