Ubuntu Geek posted 4 ways to upgrade to Ubuntu 11.04 Natty Narwhal
The next Ubuntu version 11.04 Natty Narwhal is coming soon, if you intend to upgrade to 11.04 from current Ubuntu version there are 4 ways you can choose including online and offline upgrading.4 Ways to Upgrade to Ubuntu 11.04 Natty Narwhal
