ISPConfig install problems: iptables/ipchains/ipfw not found

Hello

I'm trying to install ISPConfig on my VPS. It's a OpenVZ configuration with Ubuntu 7.10. Unfortunately the installer fails: "ERROR: iptables/ipchains/ipfw not found!".
I can't find something useful to fix this problem. Anyone who knows how to solve this problem?

Here is the log:

Thanks.

 

Did you forget to install iptables?

apt-get iptables