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Hi I've been trying to install ROS in Ubuntu 13.04 for the past two weeks. But I get an error message everytime I type in sudo apt-get install ros-hydro-desktop-full

the error is "Unable to correct problems, you have held broken packages." I've tried everything on the internet, but nothing seems to be working. Please help me out.

sudo apt-get install ros-hydro-desktop
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-hydro-desktop : Depends: ros-hydro-common-tutorials but it is not going to be installed
                     Depends: ros-hydro-geometry-tutorials but it is not going to be installed
                     Depends: ros-hydro-robot but it is not going to be installed
                     Depends: ros-hydro-ros-full but it is not going to be installed
                     Depends: ros-hydro-ros-tutorials but it is not going to be installed
                     Depends: ros-hydro-urdf-tutorial but it is not going to be installed
                     Depends: ros-hydro-visualization-tutorials but it is not going to be installed
                     Depends: ros-hydro-viz but it is not going to be installed
E: Unable to correct problems, you have held broken packages.