juju add-machine kvm:0 not working with maas

After juju add-machine kvm:0
container is staying eternally in pending state

juju destroy-machine keep the container in pending and never dies

juju status
environment: maas
machines:
  "0":
    agent-state: started
    agent-version: 1.17.3.1
    dns-name: g-l5.maas.rd.francetelecom.fr
    instance-id: /MAAS/api/1.0/nodes/node-a6714c4e-7df9-11e3-9d6d-001a6411113a/
    series: trusty
    containers:
      0/kvm/0:
        instance-id: pending
        life: dying
        series: trusty
      0/kvm/1:
        instance-id: pending
        series: trusty
services: {}
admrsc@g-virtual05:~/gocode/src/launchpad.net$

libvirt is not installed in machine '0' and installing it doesn't solve anything

Cheers