install the docker 1.9-dev to ubuntu 14.04

docker_1.9_on_ubuntu_14.04.md

###add patch

get the script from https://get.docker.com/ubuntu/, the script is:

# Check that HTTPS transport is available to APT
if [ ! -e /usr/lib/apt/methods/https ]; then
	apt-get update
	apt-get install -y apt-transport-https
fi

# Add the repository to your APT sources
echo deb https://get.docker.com/ubuntu docker main > /etc/apt/sources.list.d/docker.list

# Then import the repository key
apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9

# Install docker
apt-get update
apt-get install -y lxc-docker

#
# Alternatively, just use the curl-able install.sh script provided at https://get.docker.com
#

then run this script

###get the docker 1.9 and start

start the docker like:

$ sudo ./docker daemon -H unix:///var/run/docker.sock

To make it work in Lubuntu 15.1 i ran the script, but the command bellow to start the docker didn't work, so i had to type this:

systemctl unmask docker.service
systemctl unmask docker.socket
systemctl start docker.service

As seen here:
https://groups.google.com/d/msg/docker-user/3Sou7Umo0SA/wrjojGt3YdgJ

Thank you both!, I can confirm that the actions EliaMelfior describe are also required on Lubuntu 15.04