how to delpoy Kilo release with landscape

hello, i used landscape to deploy Openstack Juno successfully, but failed to choose Kilo release even with command "$ sudo openstack-install --openstack-release kilo", the release is still Juno, what i missed?below is my steps here:

openstack@ubuntukevin:~$ sudo add-apt-repository ppa:juju/stable
openstack@ubuntukevin:~$ sudo add-apt-repository ppa:maas-maintainers/stable
openstack@ubuntukevin:~$ sudo add-apt-repository ppa:cloud-installer/stable
openstack@CA-MAAS:~$ sudo openstack-install --openstack-release kilo
openstack@CA-MAAS:~/.cloud-install$ cat openstack_release
kilo
openstack@CA-MAAS:~/.cloud-install$ cat config.yaml
current_state: 0
install_type: Landscape OpenStack Autopilot
landscapecreds:
  admin_email: <email address hidden>
  admin_name: admin
  maas_apikey: PHrNqrVFQtpwJy8xvL:59ra8BN5aPe2KJwnr4:qUZsvkkjRFpdKp8NNs35Hz8mjmU5EFzs
  maas_server: 192.168.100.2
  system_email: <email address hidden>
maascreds:
  api_host: 192.168.100.2
  api_key: PHrNqrVFQtpwJy8xvL:59ra8BN5aPe2KJwnr4:qUZsvkkjRFpdKp8NNs35Hz8mjmU5EFzs
openstack_password: Openstack
openstack_release: kilo

deploy Openstack on 5 nodes successfully, chec Openstack release, it is Juno
ubuntu@X179005:~$ sudo dpkg -l | grep nova
ii nova-common 1:2014.2.3-0ubuntu1.2~cloud0 all OpenStack Compute - common files
ii nova-compute 1:2014.2.3-0ubuntu1.2~cloud0 all OpenStack Compute - compute node base
ii nova-compute-kvm 1:2014.2.3-0ubuntu1.2~cloud0 all OpenStack Compute - compute node (KVM)
ii nova-compute-libvirt 1:2014.2.3-0ubuntu1.2~cloud0 all OpenStack Compute - compute node libvirt support
ii python-nova 1:2014.2.3-0ubuntu1.2~cloud0 all OpenStack Compute Python libraries
ii python-novaclient 1:2.19.0-0ubuntu1~cloud0 all client library for OpenStack Compute API
ubuntu@X179005:~$ sudo dpkg -l | grep cinder
ii cinder-api 1:2014.2.3-0ubuntu1.1~cloud0 all Cinder storage service - API server
ii cinder-common 1:2014.2.3-0ubuntu1.1~cloud0 all Cinder storage service - common files
ii cinder-scheduler 1:2014.2.3-0ubuntu1.1~cloud0 all Cinder storage service - Scheduler server
ii cinder-volume 1:2014.2.3-0ubuntu1.1~cloud0 all Cinder storage service - Volume server
ii python-cinder 1:2014.2.3-0ubuntu1.1~cloud0 all Cinder Python libraries
ii python-cinderclient 1:1.1.0-0ubuntu1~cloud0 all python bindings to the OpenStack Volume API