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i was missing gazebo_ros_pkgs, when I installed them, sudo apt-get install ros-kinetic-gazebo-ros-pkgs ros-kinetic-gazebo-ros-control

Now, the camera topics are getting published.

$ rostopic info /ardrone/front/image_raw
Type: sensor_msgs/Image

Publishers: 
 * /gazebo (http://dyana-Inspiron-3542:39613/)

Subscribers: * /gazebo (http://dyana-Inspiron-3542:39613/)

i was missing gazebo_ros_pkgs, when and I installed them, sudo apt-get install ros-kinetic-gazebo-ros-pkgs ros-kinetic-gazebo-ros-control

Now, the camera topics are getting published.

$ rostopic info /ardrone/front/image_raw
Type: sensor_msgs/Image

Publishers: 
 * /gazebo (http://dyana-Inspiron-3542:39613/)

Subscribers: * /gazebo (http://dyana-Inspiron-3542:39613/)