4.now your system will check for new upgrades and will ask to upgrade.. then enter y for upgrade enter N for cancel enter d for the details..
If you plan to upgrade your system with the GUI (Graphical User Interface) you can do it like this.. 1. open the update-manager System -> Administration -> Update Manager
2. then you will see a message like "New Ubuntu release '10.10' is available" then click on the upgrade button to do upgrade...
NOTE: if your system will not detect any new upgrades you should edit a file in /etc/update-manager/release-upgrades. Read the next article "Problem with the upgrade ubuntu 10.04 to 10.10"