How to Update / Upgrade from Linux Mint 14 Nadia to Linux Mint 15 Olivia

Hello Linux Users. In this article I will show you how to upgrade / update your Linux Mint 14 Nadia to Linux Mint 15 Olivia, by changing the repositories and fully updating system with apt.
Use these two oneliners to replace all “quantal” with “raring” and “nadia” with “olivia”, in order to get the needed repos.
$ sudo sed -i 's/quantal/raring/' /etc/apt/sources.list
$ sudo sed -i 's/nadia/olivia/' /etc/apt/sources.list
Fully update the system
$ sudo apt-get update && sudo apt-get dist-upgrade