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Fix Git 'index.lock' File Exists Error on Linux - Docker Nginx 502 Error: Environment Variable Fix-Resolve Error 0x800f081f Using System File Checker

2026-07-28 09:20:50backup-recovery

Fix Git 'index.lock' File Exists Error on Linux - Docker Nginx 502 Error: Environment Variable Fix-Resolve Error 0x800f081f Using System File Checker

Final checklist

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