KPackageKit fails to install ttf-mscorefonts-installer

KPackageKit says the package "ttf-mscorefonts-installer" has been installed, but it hasn't.
Running a "apt-get install ttf-mscorefonts-installer" shows the EULA notice with dialog and then installs the fonts.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: kpackagekit 0.6.3.3-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
Architecture: amd64
Date: Mon Jun 27 19:47:37 2011
InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427)
ProcEnviron:
 LANGUAGE=
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kpackagekit
UpgradeStatus: No upgrade log present (probably fresh install)