Skype 4.0 still looks like 2.2 beta
Solution 1:
Here's how to upgrade to 4.0 from the previous 2.2 beta version:
from: http://ubuntuforums.org/showthread.php?t=1695589
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)
sudo apt-get autoremove --purge skype
mv ~/.Skype ~/.Skype.bak
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:
e.g., sudo dpkg -i ~/Downloads/skype-ubuntu_4.0.0.7-1_amd64.deb
this will fail with an error. that's ok! we have to run the following command to fix dependencies:
sudo apt-get install -f
now install again:
sudo dpkg -i ~/Downloads/skype-ubuntu_4.0.0.7-1_amd64.deb