Installing Skype from the website does not install these additional dependencies:
libdbusmenu-qt2:i386
sni-qt:i386
One of which (sni-qt:i386
) is needed for this functionality, so either just install this additional dependency with:
sudo apt-get install sni-qt:i386
Or replace your current Skype installation with the one from the repository which will install the extra stuff and remove the Skype you installed from the website (which is known as skype:i386
):
sudo apt-get install skype
This should work for Unity, however if you are using Gnome then you should install this extension: Appindicator Support.
Also please don't say that I am just ripping off this answer, because if you look in the edit history for it, you will see that I basically wrote it all anyway.