📖 ~1 min read
Table of contents
Symptom & Impact
Requested package cannot install and dependent services remain unavailable.
Environment & Reproduction
Appears after mixed repositories, interrupted upgrades, or manual dpkg installs.
Root Cause Analysis
Dependency graph contains incompatible versions or unconfigured package state.
Quick Triage
Run apt check and identify broken package chain and held transitions.
Step-by-Step Diagnosis
Use resolver debug output to map conflicting package candidates.
Solution – Primary Fix
Repair dpkg state and resolve package versions to consistent repository set.
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Solution – Alternative Approaches
Pin known-good versions or use backports selectively with strict policy.
Verification & Acceptance Criteria
Target package installs successfully and apt check reports no issues.
Rollback Plan
Downgrade to previous package set from cache if compatibility breaks.
Prevention & Hardening
Avoid repository sprawl and enforce staged upgrade testing.
Related Errors & Cross-Refs
Frequently linked with held packages and obsolete mirror entries.
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 dependency resolution and apt troubleshooting docs.
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