Comment 4 for bug 234122

I don't think this is the right direction to be going in to fix this (to be honest I'm not sure if it's even a bug, really). fail2ban already Recommends iptables and recommended packages are installed by default in recent version of Ubuntu. It's going to be a fairly rare edge-case where this is actually an issue and iptables is not present. However, I don't know what other people's opinions are on this issue, so I'll leave it open for now.