If you have just configured some settings in Ubuntu 13.04 and Unity or Compiz are not working like the way they should, it’s easy to go back and reset or restore Unity and Compiz to the default settings. This is one of the many ways to revert or roll back changes that break Ubuntu Unity or Compiz.
Running the commands below will reset Unity Launcher, Multi-monitors, Compiz animations and effects and other hidden settings.
The previous unity –reset command that was used to reset changes in Ubuntu 12.04 is now retired and will no longer work in Ubuntu 12.10 or 13.04.
To reset your Unity session in Ubuntu 12.10 and 13.04, you must follow the steps below.
1) Install dconf tool – this tool lets you configure hidden settings in Ubuntu and its purpose is to provide a backend to GSettings.
To install it press Ctrl – Alt – T on your keyboard to open the terminal or console, then run the commands below. If it’s already installed, skip to step 2
sudo apt-get install dconf-tools
2) run the commands below to reset Unity and Compizdconf reset -f /org/compiz/
To reset the Unity Launcher and default icons, run the commands below.unity --reset-icons
Logout and log back in.