sudo apt-get install ros-indigo-desktop-full                                                                                                        │·····
[sudo] password for tushar:                                                                                                                                       │·····
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-indigo-desktop-full : Depends: ros-indigo-simulators but it is not going to be installed                                                                     │·····
                           Depends: ros-indigo-urdf-tutorial but it is not going to be installed                                                                  │·····
E: Unable to correct problems, you have held broken packages.