install opera from deb source

install-opera.sh

#!/bin/bash
# install opera (can change from beta to stable)
# watch out for possible change of pub key later in 2014. http://deb.opera.com/ 

wget -O - http://deb.opera.com/archive.key | sudo apt-key add -
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A8492E35
sudo sh -c 'echo "# deb http://deb.opera.com/opera/ stable non-free #Opera Browser (final releases)" > /etc/apt/sources.list.d/opera.list'
sudo sh -c 'echo "deb http://deb.opera.com/opera-beta/ stable non-free #Opera Browser (beta releases)" >> /etc/apt/sources.list.d/opera.list'
sudo apt-get update && sudo apt-get upgrade
sudo apt-get install -y opera