Maneira fácil e rápida de instalar o skype no Debian:
dpkg --add-architecture i386 && aptitude update && aptitude install libc6:i386 libqt4-dbus:i386 libqt4-network:i386 libqt4-xml:i386 libqtcore4:i386 libqtgui4:i386 libqtwebkit4:i386 libstdc++6:i386 libx11-6:i386 libxext6:i386 libxss1:i386 libxv1:i386 libssl1.0.0:i386 libpulse0:i386 libasound2-plugins:i386 -y && wget -O skype-install.deb http://www.skype.com/go/getskype-linux-deb && dpkg -i skype-install.deb;
Se acontecer erro de falha de dependências execute:
apt-get -f install