📖 ~1 min read
Table of contents
Symptom & Impact
apt exits with unmet dependency errors and package installs fail.
Environment & Reproduction
Common after abrupt reboot, timeout, or mirror disruption during upgrade.
Root Cause Analysis
Partially configured packages leave dependency chains unresolved.
Quick Triage
Audit package status and run safe repair actions.
Step-by-Step Diagnosis
Use apt logs to identify the first failing package and held packages.
Solution – Primary Fix
Finish configuration and repair dependencies with a full transaction.
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Solution – Alternative Approaches
Remove conflicting package versions, then reinstall required dependencies.
Verification & Acceptance Criteria
No broken packages remain and standard upgrades complete.
Rollback Plan
Pin known-good package versions if regression appears.
Prevention & Hardening
Use reliable mirrors and avoid interrupting apt transactions.
Related Errors & Cross-Refs
Related to held packages and third-party repository conflicts.
Related tutorial: View the step-by-step tutorial for Debian 13.
View all Debian 13 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Debian package management troubleshooting guides.
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