I found this post: http://community.skype.com/t5/Linux/Where-can-I-download-old-version-of-skype-for-Linux/td-p/913586
$this->bbcode_second_pass_quote('', 'â')€Ž30-07-2012 16:59
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Hello,
Actually the answer to your question can be found in a previous query:
http://community.skype.com/t5/Linux/How-do-I-download-the-deb-file-from-ubuntu-Softwate-center/td-p/900200
which gives the following links:
http://download.skype.com/linux/skype-ubuntu_2.2.0.35-1_i386.deb
http://download.skype.com/linux/skype_static-2.2.0.35.tar.bz2
http://download.skype.com/linux/skype-2.2.0.35.tar.bz2
Even I raised a similar question, without seeing the above post:
http://community.skype.com/t5/Linux/skype-4-0-not-working-behind-proxy-server-on-ubuntu-12-04/td-p/912872
I found another link specifically for ubuntu: https://launchpad.net/ubuntu/+source/skype/2.2.0.35-0precise3/
Hope this helps!
Xlearner