Debian Linux Triage

This one walks you through systematic Debian troubleshooting using the distribution's native tools. It structures your debugging process with systemctl service checks, journalctl log analysis, and apt package management diagnostics. What I like is that it gives you copy-paste commands for each step and includes verification after changes, plus it remembers Debian-specific quirks like AppArmor policies that might be blocking services. Good for when you're stuck on a cryptic boot issue or broken package dependency and need a methodical approach rather than random Stack Overflow commands.