I have Skype installed via Software Center on clean copy of Ubuntu 11.04. Skype package version is
188.8.131.52-1maverick1. Voice calls work perfectly fine both ways. But notification sounds do not work at all, which is weird since they use exactly the same audio device.
On the screen below, if I click
Make a test call it works fine. If I click
Make a test sound I hear nothing at all.
Hardware is 2010 MBP 13" (7,1) with nVidia soundcard.
00:08.0 Audio device: nVidia Corporation MCP89 High Definition Audio (rev a2)