Here is a little script that will install docker for you from their official repositories without many headaches.
WARNING: This script was designed with new installations in mind, if you already have docker installed from the Debian repositories, uninstall it first to avoid conflicts.
To use the script just copy the following code to a .sh file and execute it as root:
#Docker installation script for Debian by KALRONG apt-get update apt-get -y upgrade apt-get -y dist-upgrade apt-get -y install screen apt-transport-https ca-certificates gnupg2 apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D echo "deb https://apt.dockerproject.org/repo debian-jessie main" > /etc/apt/sources.list.d/docker.list apt-get update apt-get -y install docker-engine
As you can see is not very complex hehe hope it helps you.
Best regards and thanks for your visit!