Currently, i use ubuntu 11.10 but i wan to update to ubuntu 12.04. i don't want to format and reinstall ubuntu 12.04
Ubuntu 12.04 is not released yet and releasing in just 19 days.
Once released you will be able to upgrade ubuntu easily without formatting.
Here is how to upgrade from command line
sudo apt-get update
sudo aptitude install update-manager-core
it'll take a while to download and install files, once done you'll be on ubuntu 12.04
Ubuntu 13.04 code named Raring Ringtail is released download ubuntu 13.04. Download while it's hot!!
Copyright © 2008 - 2013 - All rights reserved ubun2.com Ubuntu Forums Questions Answers Help Wiki. Ubuntu and it's logo is a registered trademark of Canonical and we're in no way directly or indirectly affiliated with Canonical.