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The UART usually enumerates under a device name like /dev/ttyS0 or /dev/ttyS1.

Try changing the port parameter to the hardware UART device name in your launch file.

<launch>
    <node pkg="imu_um6" type="imu_um6_node.py" name="imu_um6_node" output="screen" respawn="true">
        <param name="port" type="string" value="/dev/ttyS0"/>
    </node>
</launch>

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