Recover disappeared Application Menu or panel in ubuntu

This tutorial will explain how to recover disappeared Application Menu, Places Menu and System Menu in ubuntu

Procedure to follow

1) First you need to Boot the system upto Login Window and now Press Ctrl+Alt+F1

2) Now You will get a Text based login screen use your username and password to login

3) run the following Command from your terminal
   
   sudo gconftool – -recursive-unset /apps/panel

   sudo rm -rf .gnome .gnome2 .gconf .gconfd

Now Press Ctrl+Alt+F7 you get your normal GUI login window.
{if you dnt get ,than restart your system  }