The part about Linux distributions: "Linux" is a name, so it stays. "Distributions" becomes "distros|versions|editions." But maybe better as "distros|flavors|types."
Finally, after substituting all terms, I need to present the result in the specified format, ensuring names are untouched and only provide the result without any explanations. Let me double-check each substitution to confirm accuracy and that the three options make sense in context. The part about Linux distributions: "Linux" is a
SARDU
The last part: "Troubleshooting system issues" would be "diagnosing system problems|fixing technical difficulties|resolving errors." after substituting all terms