I used the following Terminal command to install Skype: "sudo apt update && sudo apt install skype", as advised in this tutorial. But at the end of the installation attempt it says it was unable to locate the package Skype
Just write it on terminal
sudo add-apt-repository "deb http://archive.canonical.com/ $(lsb_release -sc) partner" sudo apt-get update sudo apt-get install skype
I just tested it here, it works.