I did the following :
sudo apt-get install python-software-properties
sudo add-apt-repository ppa:juju/stable
sudo add-apt-repository ppa:maas/stable
sudo add-apt-repository ppa:cloud-installer/stable
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install maas
sudo maas-region-admin createadmin
#MAAS web – Added images, only 16.04 for now
#MAAS web – Added in the kernel parameters "console=ttyS0,115200” and changed the upstream DNS in Settings and in the subnet.
#MAAS web – Enabled DHCP on the subnet
ssh-keygen
cat ~/.ssh/id_rsa.pub
#MAAS web – Added the ssh key in my account
#I added and commissioned my nodes
sudo apt install conjure-up
sudo lxd init
  Dir
  No
  Yes 
#Stop bind9 otherwise lxdbr0 is not added
sudo systemctl stop bind9
sudo systemctl start lxd-bridge.service
lxc finger
lxc list
conjure-up openstack
 
I select “OpenStack” and “Connect to an existing MAAS”  (Choosing to deploy with landscape fail because “trusty”)
I enter my information :
http://${my-maas-server}:80/MAAS/
${API-Key}
The bootstrapping start and the node eventually change its status to deployed in MAAS.
Unfortunately conjure fail some time later showing the following screen :