The Raspberry Pi 2 is a serious upgrade over older versions, and that means you’ll need to update a lot of your software to use it. You could make a whole new SD card, but if you have old projects that you don’t want to lose, The Pi Hut shows off the upgrade process in Raspbian.

Full article here:
Easily Update Your Raspbian SD Cards for the Pi 2 with These Commands (Lifehacker)