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For me, the 3dm-gx3-25 showed up on /dev/ttyACM0 by defualt. Try typing ls -l /dev/ttyACM0 (assuming the imu is the only usb sensor you have connected), or you can try with process of elimination by disconnecting the sensor (wait about 5-10 seconds for the usb device to unregister), typing ls -l /dev/tty to view the whole list. Then connect the sensor, and view the list again. You should either see a new /dev/ttyACM or a new /dev/ttyUSB .

Id also recommend that you set up some udev rules. You can use this one