Upgrading Ubuntu 10.04 (Lucid) to 10.10 (Maverick)

Steps to upgrade ubuntu v10.04 to v10.10 are very simple.
Option A. Using Update Manager (System -> Adminstration -> Update Manager)
 1. Start Update Manager.
 2. Click on Settings button
 3. Choose the Update Tab in Software Sources.
 4. Select Normal releases in the Show new distribution releases: drop-down menu and click on Close button.
 5. Back in Update Manager  and click on Check Button.
 6. Update Manager shows the new release is available.  Click on Upgrade button to start new distribution upgrade on your system.

Option B.
 1. Open Software Sources (System -> Adminstration -> Software Sources)
 2. Choose the Update Tab in Software Sources.

 3. Select Normal releases in the Show new distribution releases: drop-down menu and click on Close button. 

 4. Open Update Manager (System -> Adminstration -> Update Manager) and click on Check Button. 

 5. Update Manager shows the new release is available.  Click on Upgrade button to start new distribution upgrade on your system.

Hope this simple tutorial helps!