Installaion issue: fatal error

On a fresh debian 4, the installation script fails after execution the following line:

INFO - 2009-01-19 19:06:54 - Installing dependencies using command: /usr/bin/apt-get --config-file apt.conf.noninteractive -y --force-yes install postfix postfi
x-pcre webmin usermin ruby libapache2-mod-ruby libxml-simple-perl libcrypt-ssleay-perl unzip zip
Reading package lists...
Building dependency tree...
Package webmin is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or is only available from another source
FATAL - 2009-01-19 19:06:55 - Fatal Error Occurred: Something went wrong during installation: 0

I have attached the installation log file. Any help is apprecheated.

Closed (fixed)