Error while installing ROS on ubuntu 12.04

When i run the

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


i get this error message 

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.

Solution :

sudo aptitude install ros-hydro-desktop-full

Unable to connect to RDP server

I faced this error while connecting to AWS .I was using Linux OS and remina for connecting with AWS .

Solution:
Go to advance setting of the connection in remina and select security to RDP.

Unable to correct problems, you have held broken packages

I face this problem while installing the openshot in linux 12.04

and for me installing it with aptitude works

sudo aptitude install openshot

generally if you face this problem you can install the package like this 

sudo aptitude install <packagename>