libreoffice:
  Installed: (none)
  Candidate: 1:5.1.6~rc2-0ubuntu1~xenial1
  Version table:
     1:5.1.6~rc2-0ubuntu1~xenial1 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages
     1:5.1.2-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages