Just a fast tip, if you want to have a ssh server more secure disable root access in "/etc/ssh/sshd_config"
Find the line starting with PermitRootLogin and set it to nojust like this:
I already setup my ubuntu server, and have infos about ssh and other configurations. I'm translating the old articles to english first, so don't get angry if I take a little time to post it. I hope in the next month the portuguese version and the english, start to run together 😉