my system was hardened (not saying it was perfect but it was reasonably safe)
i installed apparmor,selinux, harded the kernel, encrypted huge partions of my hardrive with truecrypt, used a password safe, only used aes encryption, setup firewalls (software firewall and physical firewall), used strong passwords, installed snort, installed 2 anti virus programs, checked all ports (all were steathed none were open) ~ updated my system often, i only downloaded programs from the ubuntu software center.
i found out before my system was scanned that something was wrong, i was using nmap and was seeing odd packet traffic activity yes from 3 ports (failed to write it down) and had higher then normal cpu usage
the only thing i would change is connect to the internet with a secure encrypted vpn. ya ill power down now...