I've had some trouble getting skype to work in ubuntu 13.04. The first problem arose after switching to the nvidia binary graphics drivers. Skype kept trying to load the 64bit libraries instead of the 32bit compatability ones. This can be repaired by changing the linker's search path. The command to launch skype then is:
~$ LD_LIBRARY_PATH=/usr/lib32 skype
The second problem was that skype could not find pulse audio, so it was trying
to look up hardware devices using ALSA (or so I've guessed by stdout). The
solution is to install
~$ sudo apt-get install libpulse0:i386
After restarting skype my microphone and audio devices are all listed as "pulse audio" instead of having a dropdown for various options.
Also, as of skype 18.104.22.168 screen sharing appears to now be available in the linux version… finally.