Comment 3 for bug 649284

Because the linux-generic fix in question was an ABI change, a new package not previously installed was pulled. However, it was not from security either:

$ apt-cache policy linux-image-generic
linux-image-generic:
  Installed: 2.6.32.25.27
  Candidate: 2.6.32.25.27
  Version table:
 *** 2.6.32.25.27 0
        500 http://fi.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
        100 /var/lib/dpkg/status
     2.6.32.24.25 0
        500 http://security.ubuntu.com/ubuntu/ lucid-security/main Packages
     2.6.32.21.22 0
        500 http://fi.archive.ubuntu.com/ubuntu/ lucid/main Packages
$ apt-cache policy linux-image-2.6.32-25-generic
linux-image-2.6.32-25-generic:
  Installed: 2.6.32-25.44
  Candidate: 2.6.32-25.44
  Version table:
 *** 2.6.32-25.44 0
        500 http://fi.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
        100 /var/lib/dpkg/status
$

(These commands executed after applying the update. Nothing vsible in kpackagekit at this point of time anymore of course)