GNU/Linux General Troubleshooting Guide for Beginners - LinuxConfig.org

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In this guide, our goal is to learn about the tools and environment provided by a typical GNU/Linux system to be able to start troubleshooting even on an unknown machine. To do so, we will go through two simple example issues: we will solve a desktop and server side problem.

This is a companion discussion topic for the original entry at https://linuxconfig.org/gnu-linux-general-troubleshooting-guide-for-beginners
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I have found a command cheat sheet works best for beginners rather than remembering commands. Eventually you remember the commands you use the most. I also like the pkill command over PID for killing processes if one knows which program is causing the problem.