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pointcloud_to_laserscan was part of the turtlebot stack in Electric and Fuerte, but was removed in Groovy in favor of the much faster depthimage_to_laserscan.

If you're using a depth sensor (Kinect, Xtion, etc), I suggest trying depthimage_to_laserscan. If you really need to convert a PointCloud2 to a laserscan, you should be able to pull an old version of the source and build it yourself. I would try the last version that was released into fuerte: https://github.com/turtlebot/turtlebot/tree/fuerte (check out the fuerte tag)