I've just installed skype 4.0 for my Ubuntu 12.4LTS and the font and setup of it still looks like the older ersion 2.2 beta. I've tryed reinstalling it, and rebooting my computer but it doesn't help. I know that it's suppose to look differently according to screenshots of other people using it.
Here's how to upgrade to 4.0 from the previous 2.2 beta version:
1) make sure the old version is purged, and that old config files are moved to a backup folder (in case you want to restore them later if there's a problem)
2) download the 4.0 deb from the skype website (http://www.skype.com/intl/fr/get-skype/on-your-computer/linux/) and install from commandline:
this will fail with an error. that's ok! we have to run the following command to fix dependencies:
now install again: