I've noticed a few people with Ubuntu having problems with GWC.
I suspect it is something not right in Ubuntu's configuration of gnome, but I could only guess.
I have a netbook with ubuntu on it, and while I could compile GWC, I couldn't make the sound
work using the ALSA driver. So I coded up the pulse audio driver, and got that working
on my main workstation. I have not yet tried it on my netbook, but here's GWC with direct
support for Pulse audio. Let me know how it works.
I probably haven't got the configure script quite right. Pulse audio is enabled by default
on this version. A "./configure" will attempt to find the pulse audio development files.
On fedora, the package is named "pulseaudio-libs-devel", I'm not sure what the equivalent
ubuntu package is named...