Possible Duplicate:
How to upgrade Ubuntu from an ISO image
I have downloaded & burnt iso of Ubuntu v11.10 & was trying to upgrade my current installation (running v11.04) when i ran into a strange issue. The installer (when i boot from media) does not detect my existing Ubuntu setup. It detects my Windows 7 installation & gives me 3 choices but NO upgrade choice. When i try upgrading in (while running) Ubuntu - it tries to download the upgrades again.
Isn't there a method where i can upgrade my existing installation just using the media?
