There is a new problem on 64 bit system.
If you have installed Skype and libaudio2:i386 you have to remove them from the system.
libaudio2:i386 makes a conflict with libaudio2 (amd64).
The issue has been reported already:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=768651#15
and the solution is:
apt-get install -f -o Dpkg::Options::="--force-overwrite" libaudio2