📖 ~1 min read
Table of contents
Symptom & Impact
Package installation fails with unmet dependencies and blocked upgrades.
Environment & Reproduction
Debian 10 systems mix repositories and contain held packages from older pinning.
Root Cause Analysis
Partial upgrades and pin conflicts produce incompatible version constraints.
Quick Triage
List held packages and run dry solver checks before any forced install.
Step-by-Step Diagnosis
Review apt policy and resolver output to isolate blocking dependency edges.
Solution – Primary Fix
Repair dependency chains, align repository priorities, and complete full upgrade.
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Solution – Alternative Approaches
Use targeted downgrades or temporary pin adjustments with strict change control.
Verification & Acceptance Criteria
No broken package state remains and upgrade path completes successfully.
Rollback Plan
Reapply previous pin file and reinstall known good package versions.
Prevention & Hardening
Standardize repository definitions and test upgrades in staging first.
Related Errors & Cross-Refs
Often appears alongside apt lock issues and repository signature failures.
Related tutorial: View the step-by-step tutorial for debian-10.
View all debian-10 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Debian package pinning and apt resolver troubleshooting documentation.
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