apt-cache policy unity
unity:
  Installed: 7.2.3+14.04.20140826-0ubuntu1
  Candidate: 7.2.4+14.04.20141217-0ubuntu1
  Version table:
     7.2.4+14.04.20141217-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
 *** 7.2.3+14.04.20140826-0ubuntu1 0
        100 /var/lib/dpkg/status
     7.2.2+14.04.20140714-0ubuntu1.1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
     7.2.0+14.04.20140416-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages