Installing Updates - problem that we were not expecting has occurred

[Richard]

When installing updates both security and bug fixes via the Software Updates - KDE control Module i get the following error:

A problem that we were not expecting has occurred.
Please report this bug with the error description.
Details:
The backend took too much time to process the synchronous request - you need to fork!

any ideas ?
++++++++++++++++++
Distributor ID: Ubuntu
Description: Ubuntu 9.04
Release: 9.04
Codename: jaunty
KDE: Version 4.2.2 (KDE 4.2.2)
Kernel: 2.6.28-11-generic
++++++++++++++++++

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
HibernationDevice: RESUME=UUID=de00a9e8-bbcb-4832-8015-eedfc9de6239
MachineType:

NonfreeKernelModules: nvidia
Package: linux-image-2.6.28-11-generic 2.6.28-11.42
ProcCmdLine: root=UUID=5d2d3166-8333-42f9-a1bb-9e961ec517df ro quiet splash
ProcEnviron:
 LANGUAGE=
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.28-11.42-generic
SourcePackage: linux