linux-headers-generic:
  Installed: 3.13.0.44.51
  Candidate: 3.13.0.45.52
  Version table:
     3.13.0.45.52 0
        500 http://ca.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
 *** 3.13.0.44.51 0
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
        100 /var/lib/dpkg/status
     3.13.0.24.28 0
        500 http://ca.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages