Comment 4 for bug 1401867

Verified on trusty with the package from trusty-proposed:

root@juju-machine-0-lxc-25:~# apt-cache policy landscape-client
landscape-client:
  Installed: 14.12-0ubuntu0.14.04
  Candidate: 14.12-0ubuntu0.14.04
  Version table:
 *** 14.12-0ubuntu0.14.04 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     14.01-0ubuntu3 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

After the upgrade, the utopic-proposed one was installed:
root@juju-machine-0-lxc-25:/etc/apt/sources.list.d# apt-cache policy landscape-client
landscape-client:
  Installed: 14.12-0ubuntu0.14.10
  Candidate: 14.12-0ubuntu0.14.10
  Version table:
 *** 14.12-0ubuntu0.14.10 0
        500 http://archive.ubuntu.com/ubuntu/ utopic-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     14.01-0ubuntu3 0
        500 http://archive.ubuntu.com/ubuntu/ utopic/main amd64 Packages

Screenshot shows the result of the release upgrade.