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I have the same problem : my ROS_PACKAGE_PATH is correct : ~/ros_workspace:/opt/ros/electric/stacks: with beginner_tutorials correctly created within ~/ros_workspace

BUT : the command roscd is missing from /opt/ros/electric/ros/bin/, while most others commands seem to be there. I installed ros-electric-desktop and ros-electric-openni-kinect, on a Ubuntu 10.04 LTS regularly updated.

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