thunderbird:
  Installed: 12.0.1+build1-0ubuntu0.11.04.1
  Candidate: 12.0.1+build1-0ubuntu0.11.04.1
  Version table:
 *** 12.0.1+build1-0ubuntu0.11.04.1 0
        500 http://ci.archive.ubuntu.com/ubuntu/ natty-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ natty-security/main amd64 Packages
        100 /var/lib/dpkg/status
     3.1.9+nobinonly-0ubuntu4 0
        500 http://ci.archive.ubuntu.com/ubuntu/ natty/main amd64 Packages