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Hi there, rospack tool uses the "ROS package name" to look for packages not the "Debian package name" (it is confusing, I know).

ros-indigo-slam-gmapping is the name of a debian package that contains the ROS packages gmapping and openslam_gmapping

So the correct way to check if the gmapping is present would be: rospack find gmapping

I assume that you are using Ubuntu 14.04, is that correct? Could you attach the console output when you execute your launch file?