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In your launch file, the two conditionals for launching inside a namespace or not are the same. I think it should be:

<launch>
  <arg name="multiple" default="false"/>
  <group if="$(arg multiple)" ns="$(arg robot)">
    <node pkg="turtlebot_dashboard" type="turtlebot_dashboard" name="turtlebot_dashboard"/>
  </group>
  <group unless="$(arg multiple)">
    <node pkg="turtlebot_dashboard" type="turtlebot_dashboard" name="turtlebot_dashboard"/>
  </group>
</launch>

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