ubuntu@ip-10-0-0-214:~$ apt-cache policy libopencv-calib3d2.4
libopencv-calib3d2.4:
  Installed: 2.4.8+dfsg1-2ubuntu1
  Candidate: 2.4.8+dfsg1-2ubuntu1
  Version table:
 *** 2.4.8+dfsg1-2ubuntu1 0
        500 http://eu-west-1.ec2.archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages
        100 /var/lib/dpkg/status