How to upgrade to Ubuntu 12.10 (Quantal Quetzal) from Ubuntu 12.04 LTS (Precise Pangolin)

The latest version of a great Linux distribution, Ubuntu 12.10 code name Quantal Quetzal, release today. You should receive the notification of this new release on Update Manager. If not:

1. Go to Settings on Update Manager and change 'Notify me of a new Ubuntu version' to 'For any new version''
2. Check again. You will see a notification 'New Ubuntu release 12.10 is available'. 
3. Click the 'Upgrade' button to upgrade to Ubuntu 12.10