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Have you tried running pointcloud_to_laserscan as a node?

From what I understand, nodelets require a nodelet manager to run. The turtlebot uses the openni_manager. Nodelets are used to process the same pointcloud through different algorithms (throttling, fake laser, narrow laser).

In your case, since you just need the fake laserscan, you probably can just run the pointcloud_to_laserscan as a node.

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