To combat these weaknesses, IT Security has prepared a guide to help you close your system's backdoors and protect you from some of the common Ubuntu exploits. Look at this big ol' Ubuntu security resource as an introductory guide to securing Ubuntu, along with a list of the software you'll need to stay protected."If you're just getting started with Ubuntu Linux, and in particular with a Windows-to-Linux desktop or server migration, this is an outstanding resource. Many of these tips, including those on how to modify Ubuntu's default settings for improved security, how to secure user home directories, and which software to rely upon for anti-rootkit protection, are essential reading for any newbie Linux admin.
Come to think of it, even if you consider yourself an experienced Linux user, it can't hurt to check out these tips. The one that you realize you missed before just might be the one that keeps uninvited visitors off your company's Linux systems -- and out of your company's vital business data.