I just downloaded and tried the last Ubuntu beta release (9.04 – Jaunty Jackalope)
The first package I set up was skype 2.0, everything went great except for the audio call feature.
I adopted the same solution well known for the previous distro (8.04 – Intrepid Ibex) as well as you can do following the lines below:
user@pc:~$ killall pulseaudio
user@pc:~$ sudo apt-get remove pulseaudio
user@pc:~$ sudo apt-get install esound
user@pc:~$ sudo rm /etc/X11/Xsession.d/70pulseaudio
That’s all.
Reboot the system and get free calls with skype again.