Ubuntu Gutsy Gibbon has gone beta and is on track for its October 18th Release. So, if you haven't been using it since tribe 2 like me, and want to upgrade from Fiesty Fawn, follow the below steps.
- Open a terminal.
- Type sudo update-manager -d
- Follow the instructions
More information about upgrading can be found here
If you want to upgrade from a cd or do a fresh install, ISOs are available here