unmet dependencies while installing Ros on Ubuntu

Hello, I'm using Ubuntu 13.04 (Raring) x64 with a virtual machine I run:

 sudo apt-get install ros-hydro-desktop-full 

I get:

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-full : Depends: ros-hydro-desktop but it is not going to be installed
                          Depends: ros-hydro-mobile but it is not going to be installed
                          Depends: ros-hydro-perception but it is not going to be installed
                          Depends: ros-hydro-simulators but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

I have followed every step on the ros wiki (from allowing "restricted," "universe," and "multiverse." to updating the index) I have also checked other solutions and many of them suggested using aptitude, still I couldn't use aptitude since I had errors while installing its package. If you need more details let me know. Help me ! Thanks :) [UPDATE] It's just that ROS Hydro didn't work out with ubuntu 13.04 due to its instability I guess. I recommend you guys, if you have this problem, to switch to a more stable ubuntu distribution (12.04 LTS worked just fine with me) Thanks :)