gnome-shell:
  Installed: 3.18.5-0ubuntu0.3
  Candidate: 3.18.5-0ubuntu0.3
  Version table:
 *** 3.18.5-0ubuntu0.3 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
        100 /var/lib/dpkg/status
     3.18.4-0ubuntu3 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages