Pulseaudio Workaround

[Eli2]

Edit: This is the last thing you should try if your sound is not working!

How to get Regnum sound going in Ubuntu Hardy.
Oh this OpenAl version is alpha and might eat your cat.

wget http://dune2.dyndns.org/projects/pulseaudio/openal-soft/libopenal.so.1.3.253
sudo mv libopenal.so.1.3.253 /usr/local/lib/libopenal.so.1.3.253
sudo mv /usr/lib/libopenal.so.0 /usr/lib/libopenal.so.0.bak
sudo mv /usr/lib/libopenal.so.0.0.0 /usr/lib/libopenal.so.0.0.0.bak
sudo ln -s /usr/local/lib/libopenal.so.1.3.253 /usr/lib/libopenal.so
sudo ln -s /usr/local/lib/libopenal.so.1.3.253 /usr/lib/libopenal.so.0
sudo ln -s /usr/local/lib/libopenal.so.1.3.253 /usr/lib/libopenal.so.0.0.0

[cs42]

Well for me it was very easy using RO with Pulseaudio. Just add the following to your .openalrc

(define devices '(esd))

This tells OpenAL to play using the ESD compatibility mode of Pulseaudio. I did just install packages from Hardy...

[Eli2]

This is an early alpha of the libopenal-soft with build in pulseaudio support.
For how you have to download the whole directory openAL and install it yourself.
That said note that it's only meant for developers to test and debug code.
Once it's stable you should search for a new openAL - soft release which includes the pulseaudio backend.
http://www.lastlog.de/wiki/index.php/Pulseaudio
Its just a bit bleeding edge ;)