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su root

echo 'deb http://http.debian.net/debian wheezy-backports main' > /etc/apt/sources.list.d/wheezy-backports.list
apt-get update && apt-get install -t wheezy-backports linux-image-amd64

# Check grub menu entries. Linux 3.16.X-amd64 should be the second entry (index = 1)
grep menuen /boot/grub/grub.cfg

sed -i "s/GRUB_DEFAULT=.*/GRUB_DEFAULT=1/" /etc/default/grub

update-grub

reboot

curl -sSL https://get.docker.com/ | sh