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2019-07-11 01:50:20 -0500 edited answer Controller Spawner couldn't find the expected controller_manager ROS interface.

Make sure the namespace is same in the gazebo plugin and the controllers.yaml file. This namespace is equal to the name

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2019-07-11 01:46:14 -0500 edited answer Controller Spawner couldn't find the expected controller_manager ROS interface.

Make sure the namespace is same in the gazebo plugin and the controllers.yaml file. This namespace is equal to the name

2019-07-11 01:42:06 -0500 answered a question Controller Spawner couldn't find the expected controller_manager ROS interface.

Make sure the namespace is same in the gazebo plugin and the controllers.yaml file. This namespace is equal to the name

2019-07-02 00:08:06 -0500 received badge  Enthusiast
2019-06-27 08:34:24 -0500 answered a question Unable to install rosserial on Ubuntu 18.04, using ROS melodic

I had the same problem. I followed this link: http://answers.ros.org/question/325039/apt-update-fails-cannot-install-pkg