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I think you are missing permissions on the device. The easiest might be to add yourself to the dialout group as in most cases that's where it is. Otherwise you need to setup udev rules.

What does ls -l /dev/ttyUSB* and id -a give you?

I think you are missing permissions on the device. The easiest might be to add yourself to the dialout group as in most cases that's where it is. Otherwise you need to setup udev rules.

What does ls -l /dev/ttyUSB* and id -a give you?

I use this udev rule for xsens:

# xsens FTDIs with product id d38b
SUBSYSTEMS=="usb", KERNEL=="ttyUSB[0-9]*", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="d38b", SYMLINK+="sensors/ftdi_%s{serial}", MODE="0666", GROUP="dialout"