Ubuntu – Error when trying to install iRedMail

I'm trying to install iRedMail mail server, but when I run the installation script, I get the following error message:

The following packages have unmet dependencies:
  php5-common: Conflicts: php5-mhash
  php5-mhash: Depends: phpapi-20060613
              Depends: php5-common (= 5.2.6.dfsg.1-3ubuntu4.5) but 5.3.2-1ubuntu4.2 is to be installed
E: Broken packages

I'm not really sure what this means. I've tried reinstalling php5-common but that doesn't make a difference.

The full log is below. Thankyou for any help with this,
Dan.


< INFO > Installing package(s): apache2 apache2-mpm-prefork apache2.2-common libapache2-mod-php5 libapache2-mod-auth-mysql php5-cli php5-imap php5-gd php5-mcrypt php5-mysql php5-ldap php5-mhash php-pear postfix postfix-pcre awstats mysql-server-5.1 mysql-client-5.1 postfix-ldap slapd ldap-utils libnet-ldap-perl postfix-policyd dovecot-imapd dovecot-pop3d amavisd-new libcrypt-openssl-rsa-perl libmail-dkim-perl clamav-freshclam clamav-daemon spamassassin altermime libmail-spf-perl python-ldap libapache2-mod-wsgi python-mysqldb python-ldap python-jinja2 python-netifaces python-webpy python-ldap bzip2 acl patch cron tofrodos php-net-ldap2 phpldapadmin phpmyadmin
Reading package lists... Done
Building dependency tree
Reading state information... Done
apache2 is already the newest version.
apache2-mpm-prefork is already the newest version.
apache2-mpm-prefork set to manually installed.
apache2.2-common is already the newest version.
apache2.2-common set to manually installed.
libapache2-mod-php5 is already the newest version.
libapache2-mod-php5 set to manually installed.
php5-gd is already the newest version.
php5-gd set to manually installed.
php5-mcrypt is already the newest version.
php5-mcrypt set to manually installed.
php5-mysql is already the newest version.
mysql-server-5.1 is already the newest version.
mysql-server-5.1 set to manually installed.
mysql-client-5.1 is already the newest version.
mysql-client-5.1 set to manually installed.
bzip2 is already the newest version.
acl is already the newest version.
cron is already the newest version.
phpmyadmin is already the newest version.
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
php5-common: Conflicts: php5-mhash
php5-mhash: Depends: phpapi-20060613
Depends: php5-common (= 5.2.6.dfsg.1-3ubuntu4.5) but 5.3.2-1ubuntu4.2 is to be installed
E: Broken packages
< ERROR > Installation failed, please check the terminal output.