kpackagekit only ever warns about updates after first logging in

Binary package hint: kpackagekit

I tend to keep my machine up and running for days at a time. I wondered why it never warned me about new package updates and then realised that it did but only after I restarted the machine and logged in again when kpackagekit popped up with 100-odd updates.

ProblemType: Bug
Architecture: amd64
Date: Wed Jan 27 14:07:23 2010
DistroRelease: Ubuntu 9.10
Package: kpackagekit 0.4.2-0ubuntu3
ProcEnviron:
 LC_TIME=en_GB.utf8
 LANGUAGE=
 PATH=(custom, user)
 LANG=en_GB.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-17.54-generic
SourcePackage: kpackagekit
Uname: Linux 2.6.31-17-generic x86_64
XsessionErrors:
 (polkit-gnome-authentication-agent-1:2626): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (firefox:3418): GLib-WARNING **: g_set_prgname() called multiple times
 (firefox:3418): GLib-WARNING **: g_set_prgname() called multiple times