okular:
  Installed: 4:15.04.2-0ubuntu3
  Candidate: 4:15.08.0-0ubuntu1
  Version table:
     4:15.08.0-0ubuntu1 0
        500 http://pl.archive.ubuntu.com/ubuntu/ wily/universe amd64 Packages
 *** 4:15.04.2-0ubuntu3 0
        100 /var/lib/dpkg/status