package mysql-client-5.1 5.1.49-1ubuntu9 failed to install/upgrade: trying to overwrite '/usr/bin/perror', which is also in package mysql-server-5.1 5.1.49-1ubuntu9

Description: Ubuntu natty (development branch)
Release: 11.04
mysql-client-5.1:
  Installed: 5.1.49-1ubuntu9
  Candidate: 5.1.54-1ubuntu3
  Version table:
     5.1.54-1ubuntu3 0
        500 http://gb.archive.ubuntu.com/ubuntu/ natty/main i386 Packages
 *** 5.1.49-1ubuntu9 0
        100 /var/lib/dpkg/status

Failed to upgrade running sudo apt-get upgrade

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: mysql-client-5.1 5.1.49-1ubuntu9
ProcVersionSignature: Ubuntu 2.6.37-12.26-generic 2.6.37
Uname: Linux 2.6.37-12-generic i686
Architecture: i386
Date: Tue Feb 1 18:29:58 2011
ErrorMessage: trying to overwrite '/usr/bin/perror', which is also in package mysql-server-5.1 5.1.49-1ubuntu9
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110112)
SourcePackage: mysql-5.1
Title: package mysql-client-5.1 5.1.49-1ubuntu9 failed to install/upgrade: trying to overwrite '/usr/bin/perror', which is also in package mysql-server-5.1 5.1.49-1ubuntu9