The following packages have unmet dependencies: ros-kinetic-simulators : Depends: ros-kinetic-gazebo-ros-pkgs but it is not going to be installed

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Hi guys I am new to ROS and Ubuntu when I am trying to install ROS with reference to ROS Installation i am getting unmet dependencies i don't know why i am getting this error I tried to install individual packages too but i am getting same error image

This is the error which i am getting

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 ros-kinetic-desktop-full : Depends: ros-kinetic-desktop but it is not going to be installed
                            Depends: ros-kinetic-perception but it is not going to be installed
                            Depends: ros-kinetic-simulators but it is not going to be installed
                            Depends: ros-kinetic-urdf-tutorial but it is not going to be installed
E: Unable to correct problems, you have held broken packages.