Installation fails...

i've tried to install Virtualmin on Ubuntu 10.04 and Debian 6, and i've got this error, what could be?

Configuration file `/etc/apache2/suexec/www-data', does not exist on system. Installing new config file as you requested. dpkg: dependency problems prevent configuration of postfix-pcre: postfix-pcre depends on postfix (= 2.7.1-1+squeeze1); however: Package postfix is not configured yet. dpkg: error processing postfix-pcre (--configure): dependency problems - leaving unconfigured Processing triggers for python-support ... Errors were encountered while processing: postfix mailman postfix-pcre

FATAL - Fatal Error Occurred: Something went wrong during installation: 0 FATAL - Cannot continue installation. FATAL - Attempting to remove virtualmin repository configuration, so the installation can be FATAL - re-attempted after any problems have been resolved. FATAL - Removing temporary directory and files.

Thanks