If you want to keep always the latest available copy of Skype on your computer, not having to check the skype home page every time, you may want to use the skype repository for Debian, which also works for Ubuntu, Check this How to
First add this line to your
deb http://download.skype.com/linux/repos/debian/ stable non-free
which can be done with this command:
sudo echo "deb http://download.skype.com/linux/repos/debian/ stable non-free" >> /etc/apt/sources.list
once that is done, install the software with:
sudo aptitude update
sudo aptitude install skype
You will have to accept untrusted packages, as I could not find the key for skype repository.
then you are done.