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 /etc/apt/sources.list

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.