I think I have the best of old versions and I will put it for everybody here .
I also googled a lot for this old Skype .deb version ( in my computer it works like a charm, in Ubuntu 8.04 ) therefore I wanted to be sure that it is old enough ( immediately after Ubuntu hardy being released or alike ) , so that I could easily upgrade it if needed thereafter.
I re-installed the Ubuntu 8.04..4 (last version of Hardy) then I googled the name of the package 18.104.22.168 so I found it in an alternate repository ;)
Look at the description of this version :
Maintainer: Skype Technologies
Depends: libasound2 (>> 1.0.12), libc6 (>= 2.3.6-6), libgcc1 (>= 1:4.1.1-12), libqt4-core (>= 4.2.1), libqt4-gui (>= 4.2.1), libstdc++6 (>= 4.1.1-12), libx11-6, libxext6, libxss1, libxv1
Description: Skype - Take a deep breath
Skype is a little piece of software that lets you make free calls to anyone else on Skype, anywhere in the world. And even though the calls are free, they are really excellent quality.
* Make free Skype-to-Skype calls to anyone else, anywhere in the world.
* Call ordinary phones and mobiles at pretty cheap rates per minute.
* Group chat with up to 100 people or conference call with up to nine others.
* See who you are talking to with free video calls.
* Free to download.
Download here : skype-debian_22.214.171.124-1_i386.deb