Did you:
dpkg-reconfigure firebird2.1-super

That automatically sets up the rc?.d links for you. Otherwise,
Marius' instructions for Hardy are here;
https://help.ubuntu.com/community/Firebird2.1

I used these line by line and had no issues on four installations (so
far).

Kurt.

> --- In firebird-support@yahoogroups.com, Chris Robinson wrote:
>
> Hi
>
> I have Ubuntu 8.03 server. I have installed Firebird 2 using apt-get.
>
> I can start and stop it, but port 3050 is closed? When I loaded on
> Debian it just worked.
>
> Chris
>