sudo apt install debian-archive-keyring
sudo apt-key update
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <your key>
sudo nano /etc/apt/sources.list
deb http://security.debian.org/ jessie/updates main
deb-src http://security.debian.org/ jessie/updates main
deb http://archive.debian.org/debian/ jessie-backports main
deb-src http://archive.debian.org/debian/ jessie-backports main
deb http://archive.debian.org/debian/ jessie main contrib non-free
deb-src http://archive.debian.org/debian/ jessie main contrib non-free
apt-get update
apt-get upgrade
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