Unable to change name in Users Settings

[leo.sutton]

Binary package hint: gnome-system-tools

When I go to the System, Administration, Users and Groups, I click on my account and then on the 'change...' button next to my name. I attmept to change the name from 'Leo' to 'Leo Sutton', however when I do, and click okay a box comes up saying 'The configuration could not be saved, An unknown error occured'. If I then attempt to do this a second time, the attempt appears to have been successful, with Leo changing to Leo Sutton next to my picture, however, this doesn't change anywhere else, and if the Users Settings is opened again, it reverts to Leo.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: gnome-system-tools 2.30.0-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.32-24.41-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic x86_64
Architecture: amd64
Date: Tue Aug 24 13:35:31 2010
ExecutablePath: /usr/bin/users-admin
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
ProcEnviron:
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: gnome-system-tools