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Currently I am using Gnome-Shell but now I want to use unity Desktop. I tried to install ubuntu-desktop by following command

sudo apt-get install ubuntu-desktop

Its showing following error

The following packages have unmet dependencies:
 ubuntu-desktop : Depends: ubuntu-session but it is not going to be installed
                  Depends: unity-control-center but it is not going to be installed
                  Depends: unity-settings-daemon but it is not going to be installed
                  Recommends: xul-ext-webaccounts but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
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Which version of Ubuntu are you using? –  Raphael Jun 18 at 6:25
Have you tried to download and install these packages externally and then use the command sudo apt-get install ubuntu-desktop? –  Raphael Jun 18 at 6:34
@Raphael 14.04,nope –  Varun Barala Jun 18 at 6:46
I think downloading those packages externally might help. –  Raphael Jun 18 at 6:51
Do you want me to write an answer with the how to? –  Raphael Jun 18 at 6:51
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