/ raspberry

Raspi: Adding (Jessie) backport sources

Create/edit file /etc/apt/sources.list.d/jessie-backports.list

Add sources

deb http://httpredir.debian.org/debian jessie-backports main contrib
deb-src http://httpredir.debian.org/debian jessie-backports main contrib

Import Keys

When running apt-get update the Debian keys will be listed as missing.
Add them via:

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 8B48AD6246925553

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7638D0442B90D010