Troubleshooting is an art as well as a science. To be effective at troubleshooting, you have to understand how something works, and where to look for issues. Knowledge helps to provide an understanding about how something works; experience helps to figure out where to look. Troubleshooting is an art because everyone has a unique way of approaching problems; it is a science because there is a methodology that, if followed, can help solve a large subset of the most common errors.
This chapter is about troubleshooting the various applications explained in this book. It is also about general troubleshooting of Linux ...