gnome-shell:
  Installed: 3.12.2-0ubuntu0~trusty2
  Candidate: 3.12.2-0ubuntu0~trusty2
  Version table:
 *** 3.12.2-0ubuntu0~trusty2 0
        500 http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status
     3.10.4-0ubuntu5.2 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/universe amd64 Packages
     3.10.4-0ubuntu5 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages