jwtiyar@jwtiyar-PC:~$ apt policy firefox
firefox:
  Installed: 56.0+build6-0ubuntu1
  Candidate: 56.0+build6-0ubuntu1
  Version table:
 *** 56.0+build6-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu artful/main amd64 Packages
        100 /var/lib/dpkg/status
jwtiyar@jwtiyar-PC:~$