package glibc-doc 2.12.1-0ubuntu9 failed to install/upgrade: trying to overwrite '/usr/share/man/man3/pthread_sigmask.3.gz', which is also in package manpages-dev 3.27-1ubuntu1

This error occured during normal
apt-get update && apt-get upgrade
Description: Ubuntu natty (development branch)
Release: 11.04

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: glibc-doc 2.12.1-0ubuntu9
ProcVersionSignature: Ubuntu 2.6.37-9.22~ppa1-lowlatency 2.6.37-rc5
Uname: Linux 2.6.37-9-lowlatency i686
Architecture: i386
Date: Sat Dec 18 12:08:50 2010
ErrorMessage: trying to overwrite '/usr/share/man/man3/pthread_sigmask.3.gz', which is also in package manpages-dev 3.27-1ubuntu1
PackageArchitecture: all
SourcePackage: eglibc
Title: package glibc-doc 2.12.1-0ubuntu9 failed to install/upgrade: trying to overwrite '/usr/share/man/man3/pthread_sigmask.3.gz', which is also in package manpages-dev 3.27-1ubuntu1