One of my Ubuntu based VPS had Webalizer installed to collect stats from webserver but it was not working because I could see not stats at /webalizer/. If thats the case with you try the following
1) Try running the webalizer crontab
root@backups:~# /etc/cron.daily/webalizer Error Opening file /usr/share/GeoIP/GeoIP.dat
So we have identified the culprit that geoip-database is not installed.
2) Fix this by installing geoip-database
root@backups:~# apt-get install geoip-database
Did it fix your problem? if not please comment below and I will be glad to help you out!!