package python-keystoneclient (not installed) failed to install/upgrade: trying to overwrite '/usr/bin/keystone', which is also in package keystone 2012.1~e3~20120113.1511-0ubuntu1

Trying to install python-keystoneclient fails as /usr/bin/keystone is also shipped in the keystone package.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: python-keystoneclient (not installed)
ProcVersionSignature: Ubuntu 3.2.0-8.15-generic 3.2.0
Uname: Linux 3.2.0-8-generic x86_64
ApportVersion: 1.90-0ubuntu2
AptOrdering:
 python-prettytable: Install
 python-keystoneclient: Install
 python-prettytable: Configure
 python-keystoneclient: Configure
Architecture: amd64
Date: Sun Jan 15 14:30:57 2012
DpkgTerminalLog:
 Unpacking python-prettytable (from .../python-prettytable_0.5-1ubuntu2_all.deb) ...
 Selecting previously unselected package python-keystoneclient.
 Unpacking python-keystoneclient (from .../python-keystoneclient_2.7+git20120105-0ubuntu3_all.deb) ...
 dpkg: error processing /var/cache/apt/archives/python-keystoneclient_2.7+git20120105-0ubuntu3_all.deb (--unpack):
  trying to overwrite '/usr/bin/keystone', which is also in package keystone 2012.1~e3~20120113.1511-0ubuntu1
DuplicateSignature:
 Unpacking python-keystoneclient (from .../python-keystoneclient_2.7+git20120105-0ubuntu3_all.deb) ...
 dpkg: error processing /var/cache/apt/archives/python-keystoneclient_2.7+git20120105-0ubuntu3_all.deb (--unpack):
  trying to overwrite '/usr/bin/keystone', which is also in package keystone 2012.1~e3~20120113.1511-0ubuntu1
ErrorMessage: trying to overwrite '/usr/bin/keystone', which is also in package keystone 2012.1~e3~20120113.1511-0ubuntu1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
SourcePackage: python-keystoneclient
Title: package python-keystoneclient (not installed) failed to install/upgrade: trying to overwrite '/usr/bin/keystone', which is also in package keystone 2012.1~e3~20120113.1511-0ubuntu1
UpgradeStatus: Upgraded to precise on 2011-05-28 (232 days ago)