One of the keys to security not mentioned previously is to keep up-to-date with at least the latest stable versions of your software. Each time a new version of a software package comes out, it corrects any known security holes found in the previous release. Also be sure to keep your operating systems patched to the latest patch level. Your network security is only as strong as the weakest host.
Refer to Chapter 7, "Managing Software," for details on how to use apt-get to update Ubuntu with newer software packages. See Chapter 35, "Kernel and Module Management," to see how to update your Linux kernel.
With effort, your system can be secure enough to keep most intruders out. Just keep your software up-to-date and keep yourself informed of potential security threats to your software, and you should be fine.
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