How to recover gnome-shell

If you found that your gnome-shell task bar missing?
And your desktop seems plain and not able to access applications menu.
You can recover your lost desktop. Follow the steps.

Apply the key combinations, Ctrl + Alt + T 
A terminal will open. Enter the following commands,

sudo su
gnome-shell --replace

You can see that, your desktop panels and menus appear again

How to install minimal gnome-shell

Execute the following command in a terminal,

sudo apt-get --no-install-recommends install gnome-shell

Installation of minimal gnome-shell is essential in the process of building live CD from scratch. 

How to install GnomeShell in Linux Mint 13 and Ubuntu 12.04

If you like traditional desktop in Linux Mint 13 Cinnamon edition and Ubuntu 12.04, you can install GnomeShell. GNOME Shell is the core user interface of the GNOME 3 desktop environment. I installed GnomeShell when my Cinnamon desktop in Linux Mint 13 showed some problems.

How to install
Open Applications > Accessories > Terminal and apply following commands.

sudo su
apt-get install gnome-shell


After completing the installation restart PC and in login screen change the session to gnome classic.