Comment 3 for bug 1791006

Assuming you mean on the MAAS machines, here's the cluster controller (same on the region controller):

pjdc@barberry:~$ dpkg-query -W curtin curtin-common python-curtin
curtin
curtin-common 0.1.0~bzr399-0ubuntu1~14.04.1
python-curtin 0.1.0~bzr399-0ubuntu1~14.04.1
pjdc@barberry:~$ apt-cache policy curtin curtin-common python-curtin
curtin:
  Installed: (none)
  Candidate: 0.1.0~bzr399-0ubuntu1~14.04.1
  Version table:
     0.1.0~bzr399-0ubuntu1~14.04.1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/universe amd64 Packages
     0.1.0~bzr126-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages
curtin-common:
  Installed: 0.1.0~bzr399-0ubuntu1~14.04.1
  Candidate: 0.1.0~bzr399-0ubuntu1~14.04.1
  Version table:
 *** 0.1.0~bzr399-0ubuntu1~14.04.1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.1.0~bzr126-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
python-curtin:
  Installed: 0.1.0~bzr399-0ubuntu1~14.04.1
  Candidate: 0.1.0~bzr399-0ubuntu1~14.04.1
  Version table:
 *** 0.1.0~bzr399-0ubuntu1~14.04.1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.1.0~bzr126-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
pjdc@barberry:~$