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rstu2005@rstu2005-Aspire-5742:~$ sudo apt-get install gnome-shell
[sudo] password for rstu2005: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package gnome-shell is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'gnome-shell' has no installation candidate
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Welcome Rohit.Run synaptic package manager,then check this line Community-maintained free and open source-software(Universe) from Settings>Repositories.Come to terminal and type this command sudo apt-get update.This should help you install Gnome-shell.

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I didn't have synaptic installed, but I simply had to run sudo apt-get update first and then I was in business. – Michael Plautz Mar 4 '15 at 21:21

This only works for Ubuntu 11.10 or newer

Go to Software Center -> Edit -> Software Sources and activate universe. Then reload your packages (Click "Check" in the Update manager). Then you can install gnome-shell through apt-get or the Software Center.

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