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Fix PuTTY Connection Refused: Check SSH Service - Node Version Mismatch: Quick Troubleshooting Guide-Ubuntu apt update GPG key missing fix

2026-06-13 13:13:23office-tools
Fix PuTTY Connection Refused: Check SSH Service - Node Version Mismatch: Quick Troubleshooting Guide-Ubuntu apt update GPG key missing fix

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.