Ros Intallation Problem
The following packages have unmet dependencies: Ros-hydro-desktop-full: Depends: ros-hydro-desktop but it is not going to be installed ros-hydro-mobile but it is not going to be installed ros-hydro-perception but it is not going to be installed ros-hydro-simulators but it is not going to be installed E: Unable to correct problems, you have held broken package
Can you provide more details? What version of Ubuntu are you using?
I also guess if the version of Ubuntu matches hydro. I'm sorry, but you set up your sources.list, didn't you?