Comment 35 for bug 273693

Do you actually get the same results as the original bug report?

ALSA lib ../../src/conf.c:2700:(snd_config_hooks_call) Cannot open shared library /usr/lib/alsa-lib/libasound_module_conf_pulse.so
ALSA lib ../../../src/pcm/pcm.c:2196:(snd_pcm_open_noupdate) Unknown PCM default

If not it would be better to file a different report, though I don't know how well Skype is supported as it is proprietary. I've fought long and hard to get it to work and suggest playing around with Skype's sound devices settings, try the different sound in/out/ring devices listed there with making test sounds until you hear something.