Error and crash upon installing OpenCV per instructions, here: https://help.ubuntu.com/community/OpenCV

Error and crash upon installing OpenCV per instructions, here: https://help.ubuntu.com/community/OpenCV

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: libcv-dev (not installed)
ProcVersionSignature: Ubuntu 2.6.38-12.51-generic-pae 2.6.38.8
Uname: Linux 2.6.38-12-generic-pae i686
NonfreeKernelModules: wl
Architecture: i386
Date: Fri Jan 13 10:42:05 2012
DpkgTerminalLog:
 Unpacking libcv-dev (from .../libcv-dev_2.1.0-3ubuntu1_i386.deb) ...
 dpkg: error processing /var/cache/apt/archives/libcv-dev_2.1.0-3ubuntu1_i386.deb (--unpack):
  trying to overwrite '/usr/bin/opencv_haartraining', which is also in package libopencv2.3-bin 2.3.1+svn6514+branch23-9~natty
ErrorMessage: trying to overwrite '/usr/bin/opencv_haartraining', which is also in package libopencv2.3-bin 2.3.1+svn6514+branch23-9~natty
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
SourcePackage: opencv
Title: package libcv-dev (not installed) failed to install/upgrade: trying to overwrite '/usr/bin/opencv_haartraining', which is also in package libopencv2.3-bin 2.3.1+svn6514+branch23-9~natty
UpgradeStatus: No upgrade log present (probably fresh install)