I will explain how to upgrade from Ubuntu 9.10 or 8.04 to Ubuntu 10.04
Before you begin upgrading:
Make sure that your system has all old updates, and to do this:
sudo apt-get update
sudo apt-get upgrade
- Upgrade from Ubuntu 9.10:
Go to : System / Administration / Update Manager , and click on Check and wait until completion to get latest updates.
Now if you have any developed new packages you have to update them. Just click Install Updates and then click Check again and you'll see this message:
Just click on Upgrade and follow the instructions that appear to you, and would have been finished.
- Upgrade from Ubuntu 8.04:
Press Alt + F2 and enter:
update-manager - devel-release
Now press Enter and follow the same instructions above.
- Upgrade to Ubuntu using the CD 10.04 Alternative:
Very important : If you have a disk labeled Ubuntu Live CD, it can not upgrade it. You need to have Alternate CD and you can get it from same page download official version.
Once you enter Ubuntu alternate CD you'll see a message that you are upgrading.