Three choices here:
1- directly from the skype download page (http://www.skype.com/go/getskype-linux-deb). This version is the last one 1.3.0.53-1. Download it and install.
2.a- With apt-get / synaptic you can install it directly from the repository (version 1.3.0.53plf6.06). First you might need to uncomment the plf repository @ /etc/apt (funny, I thought plf for ubuntu was dead)
2.b- I see an additional repository here
http://forum.skype.com/index.php?showtopic=29679&st=0 but I did not test it.