1. install webalizer
   

   sudo apt-get install webalizer

   If webalizer is not found, you have to add sources in /etc/apt/sources.list: can comment the universe sources.

2. Enable the apache2 hostname resolution: go into /etc/apache2/apache2.conf: Change

HostnameLookups Off

into

HostnameLookups On

1. By default webalizer is not well configured: it does not check in the good log. In /etc/webalizer.conf: Change
   

   LogFile         /var/log/apache/access.log.1

   to

   LogFile         /var/log/apache2/access.log

2. Test webalizer:
   

   sudo webalizer

   If you get a warning like warning: Truncating …
   It is because you did not put the hostnameLookup. If afterward, you get this message, it can be because you are attacked by a virus…

3. Run webalizer as a cronjob. This has to be run as root: Edit the root cronjobs by running the command:
   

   sudo crontab -e

   and add the line:

   0 * * * * webalizer

   With that line, every hour webalizer is run

This tutorial was taken from: http://fontignie.blogspot.com/2006/04/install-and-configure-webalizer-on.html – I do not take any credit for this howto, Im just archiving it for future reference incase the site gets taken down. – Thank you Jacques Fontignie.