📖 ~1 min read
Table of contents
Symptom & Impact
Administrative tasks fail because sudo reports permission or owner errors and exits immediately.
Environment & Reproduction
Often caused by incorrect chmod/chown operations on /usr/bin/sudo or /etc/sudoers files.
Root Cause Analysis
Setuid bit, ownership, or sudoers syntax validation is broken, preventing privilege escalation safely.
Quick Triage
Use root console or recovery mode to inspect ownership, mode bits, and visudo parse status.
Step-by-Step Diagnosis
Audit file permissions and sudoers includes, then test with visudo -c before applying fixes.
Solution – Primary Fix
Restore package-default ownership and mode, fix sudoers syntax, and validate non-root admin workflows.
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Solution – Alternative Approaches
Reinstall sudo package if binary integrity is uncertain or security baseline has drifted.
Verification & Acceptance Criteria
sudo -l works for authorized users and command execution is logged without permission errors.
Rollback Plan
Return to previous sudoers backup if restrictive policy blocks required operational commands.
Prevention & Hardening
Protect sudo paths with file integrity monitoring and manage sudoers via version-controlled templates.
Related Errors & Cross-Refs
sudo must be owned by uid 0, sudoers is mode 0777, and parse error near line.
Related tutorial: View the step-by-step tutorial for Debian 11.
View all Debian 11 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Debian sudo package notes and visudo best practices for controlled privilege delegation.
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