package kubuntu-firefox-installer (not installed) failed to install/upgrade: trying to overwrite '/usr/share/applications/firefox.desktop', which is also in package firefox 20.0+build1-0ubuntu0.12.10.3

[Dana]

Encountered error while trying to install kubuntu-desktop metapackage on ubuntu 12.10. Firefox was open during time of install

ProblemType: Package
DistroRelease: Ubuntu 12.10
Package: kubuntu-firefox-installer (not installed)
ProcVersionSignature: Ubuntu 3.5.0-28.48-generic 3.5.7.9
Uname: Linux 3.5.0-28-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Sun May 5 22:49:38 2013
DuplicateSignature:
 Unpacking kubuntu-firefox-installer (from .../kubuntu-firefox-installer_12.04ubuntu1_amd64.deb) ...
 dpkg: error processing /var/cache/apt/archives/kubuntu-firefox-installer_12.04ubuntu1_amd64.deb (--unpack):
  trying to overwrite '/usr/share/applications/firefox.desktop', which is also in package firefox 20.0+build1-0ubuntu0.12.10.3
ErrorMessage: trying to overwrite '/usr/share/applications/firefox.desktop', which is also in package firefox 20.0+build1-0ubuntu0.12.10.3
InstallationDate: Installed on 2013-04-22 (14 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
SourcePackage: kubuntu-firefox-installer
Title: package kubuntu-firefox-installer (not installed) failed to install/upgrade: trying to overwrite '/usr/share/applications/firefox.desktop', which is also in package firefox 20.0+build1-0ubuntu0.12.10.3
UpgradeStatus: No upgrade log present (probably fresh install)