"Newcomers to Ubuntu also face a decision: ordinarily it'd be a
no-brainer to go with the newest version, but Ubuntu 8.04 was
dubbed a "LTS" or "long time support" release by Canonical. This
means Ubuntu's team guarantee support for the product for several
years. This might be a deciding factor for some.
"The question must be asked then - what is different in Intrepid
Ibex? What do you gain from loading it on over merely upgrading
Hardy Heron as much as possible? "To nut this out I set up two
virtual machines using Sun's VirtualBox. On one I installed Hardy
Heron and Intrepid Ibex on the other. I used all the default
settings, except for the appropriate time zone. You can see a
screenshot of them both running on a MacBook Pro below."