I came across this today. I had exited Gazebo and yet when I looked at my topics I still saw that cmd_vel (and a bunch of others) were still being subscribed to by Gazebo. I could find no process called gaz* anything. Finally on an intuition I killed roscore which was running on another computer and restarted it and that did the trick and all traces of gazebo were gone.
Question is: was it something about how I exited Gazebo? Is this not unusual? Was my solution the right one? I also notice that with my kinetic install I am not getting the latest Gazebo. Which one should I be running? Thanks!
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