I guess everyone already knows that OpenOffice.org 3.0.0 will not be available (sad, I know) for the Intrepid Ibex (Ubuntu 8.10), because the developers did not have enough time to test it, and they will introduce it later this year. Therefore, Ubuntu 8.10 ships with OpenOffice.org 2.4.1 and, if you want to use the new and improved version, then this guide is for you! However, we will not do a fresh install of the OpenOffice suite, as we will instead only upgrade the current version in Ubuntu Intrepid.
What do I need to get started? Ubuntu 8.10 (32-bit or 64-bit), which can be downloaded from here.
OK, so... first thing, you must add the OpenOffice.org 3.0 repositories, then upgrade the installed packages. Follow the steps below!
How to Install OpenOffice.org 3.0 on Ubuntu 8.10 - Step by step tutorial with screenshots! - Softpedia