If you've already upgraded before, keep doing it this way: $ sudo sed -i 's/raring/saucy/' /etc/apt/sources.list $ sudo sed -i 's/olivia/petra/' /etc/apt/sour

If you've already upgraded before, keep doing it this way: $ sudo sed -i 's/raring/saucy/' /etc/apt/sources.list $ sudo sed -i 's/olivia/petra/' /etc/apt/sources.list $ sudo apt-get update && sudo apt-get dist-upgrade $ sudo apt-get upgrade $ sudo shutdown -r now More from here: https://gist.github.com/hgomez/7074150 https://gist.github.com/hgomez/7074150