Para atualizar o mensageiro instântaneo PIDGIN, acrescente o PPA, pelo terminal:
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com \ 67265eb522bdd6b1c69e66ed7fb8bee0a1f196a8
echo deb http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu \ `lsb_release --short --codename` main | \ sudo tee /etc/apt/sources.list.d/pidgin-ppa.list
sudo apt-get update
sudo apt-get install pidgin