Firebird 2.1 (version 2.1.0) is included by default in the Ubuntu 8.10 named Intrepid Ibex that was released on 30 October. To use it you might need this guide and also there is an repository with version 2.1.1 (recommended)
The first alpha release of Ubuntu 8.10, codenamed Intrepid Ibex, was made available on Saturday. This preliminary Intrepid prerelease includes updated packages, a new version of the Linux kernel, and an experimental new visual style.
Over at arstechnica there is a glimpse at the new Ubuntu Intrepid Ibex. A few screenshots show that Ubuntu is still going dark. The direction they are headed is not very clear. Even by scanning other user’s comments it appears its not a very popular idea, and I agree 100%! Here are 5 reasons a dark theme will only hurt Ubuntu