I tested Ubuntu 14.04 LTS in VMware. I started with a clean install. I made sure sound was working in the VM, then updated everything using this command:
sudo apt-get update && sudo apt-get upgrade
I then checked Software Updater and found a few more packages that didn’t get updated, and updated them.
I then made a backup of the VM to have a good baseline. I then installed OpenJDK 7 and the icedtea-7-plugin, using the following command:
sudo apt-get install openjdk-7-jre icedtea-7-plugin
I did not have openjdk-6, icedtea 6, or Oracle Java installed. If you do have any of those installed, try removing them to prevent any conflicts.
You can test your Java sound output any trying any Java applet that produces sound, such as this SoundApplet demo. If you don’t hear sound from it, you have an issue. If you have more than 1 sound device, check the other sound device for the sound output. In my case I only had 1 device (through virtualization), but it worked fine.
I also tried AllStar and was able to hear audio from the node announcements just fine, albeit with occasional crackle, perhaps due to the limited resources of the VM. I tried transmitting but did not get a reply from the few nodes I tried.
If you have something to add, please feel free to comment below.