Problems installing Hydro

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Trying to install Hydro i get the following problems. When i try to install one by one and go deeper i find out that libpcl-1.7 has problems how can i solve this? 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 fuerte working and i need it so i cant uninstall it, any ideas will be welcomed ;)
PD: Im installing hydro only to use the pcl-1.7 so if there is another way to use it and not install hydro that would work to