Firebird 2.0.1 included by default in ubuntu gutsy gibbon
Firebird is now included in the next ubuntu release (code named gutsy gibbon)
All you will need to do is to type this in the shell
sudo apt-get install firebird2.0-super firebird2.0-common firebird2.0-dev firebird2.0-examples
on my system i have made backups of the databases and removed all firebird related packages
sudo apt-get remove firebird2-super-server firebird2-server-common firebird2-examples firebird2-dev firebird2-common
Then i had some errors related with /var/run/firebird/2.0 directory (seems that this is an bug )
sudo mkdir -p /var/run/firebird/2.0
sudo dpkg-reconfigure firebird2.0-super