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The error tells that /dev/ttyUSB0 device is used by some other processes. As it suggests, you can check the output of lsof | grep /dev/ttyUSB0 command to see any relevant processes and kill them before running this.

You may also try re-plugging the device.

The error tells that /dev/ttyUSB0 device is used by some other processes. As it suggests, you can check the output of lsof | grep /dev/ttyUSB0 command to see any relevant processes and kill them before running this.

You may also try re-plugging the device.

UPDATE:

You can run rosnode kill imu_node to kill your previous node if it hangs. If you do not succeed with this check this topic.