Abra o terminal e insira
sudo apt-add-repository "deb http://archive.canonical.com/ $(lsb_release -sc) partner"
depois clique em enter para confirmar
digite
sudo apt-get update && sudo apt-get install skype
O Skype está disponível nos repositórios de parceiros.
apt-cache policy skype
skype:
Installed: 4.2.0.11-0ubuntu0.12.04.2
Candidate: 4.2.0.11-0ubuntu0.12.04.2
Version table:
*** 4.2.0.11-0ubuntu0.12.04.2 0
500 http://archive.canonical.com/ubuntu/ raring/partner amd64 Packages
100 /var/lib/dpkg/status