Thanks for this, I remember when I first discovered Ubuntu in 2008 I was consumed with the desire to secure it. I'm not sure why and for my needs it was technically overkill. All the time I would see people saying "Ubuntu is secure by default" "There's no ports open so a firewall is redundant." I didn't think that made sense as there is no such thing as redundant security, it will almost always just mean more secure. So basically, ha-ha-ha to those people