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I've seen the machine attribute when using a node tag, for example:

<node machine="ubuntu" name="map_server" pkg="map_server" type="map_server"args="/map.yaml" />

In you case you have an include tag calling another launch. You need to modify that file (medicbot_diff_drive_controller.launch) and use the machine attribute in each node you are calling in it.

Hope it helps

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