I recently bought the Humble Indie Bundle 6, which among very nice games, it has "Space Pirates and Zombies". When playing it on Ubuntu precise 12.04, I had this sound related error:
AL lib: oss.c:168: Could not open /dev/dsp: No such file or directory
In order to fix this error, please run:
sudo apt-get install libasound2-plugins:i386
I have read that the ia32-libs package also solves the problem, however the ia32-libs package will also install many other libraries that are not needed.