Comment 16 for bug 472518

kpackagekit is still not triggering new updates. I applied Rominet7777's fix to /usr/lib/update-notifier/apt_check.py one more time, but update-notifier-kde is a dummy package in maverick, leading to kubuntu-notification-helper, which doesn't seem to have any executables (please, correct me if I'm wrong), so I still have to check whether it works or not.
I will wait for new updates and will keep you updated on the tray icon behaviour.

$ apt-cache policy kpackagekit
kpackagekit:
  Installato: 0.6.2-0ubuntu1
  Candidato: 0.6.2-0ubuntu1
  Tabella versione:
 *** 0.6.2-0ubuntu1 0
        500 http://it.archive.ubuntu.com/ubuntu/ maverick/main i386 Packages
        100 /var/lib/dpkg/status