🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026
Affected versions: Ubuntu 24.04 LTS

πŸ“– ~1 min read

Table of contents
  1. Symptom & Impact
  2. Environment & Reproduction
  3. Root Cause Analysis
  4. Quick Triage
  5. Step-by-Step Diagnosis
  6. Solution – Primary Fix
  7. Solution – Alternative Approaches
  8. Verification & Acceptance Criteria
  9. Rollback Plan
  10. Prevention & Hardening
  11. Related Errors & Cross-Refs
  12. References & Further Reading

Symptom & Impact

System upgrades halt due to unresolved package dependency chains.

Environment & Reproduction

Appears with mixed repositories or held packages.

sudo apt full-upgrade

Root Cause Analysis

Pinned versions, holds, or stale indexes produce incompatible dependency constraints.

Quick Triage

Inspect held packages and candidate versions.

apt-mark showhold && apt policy

Step-by-Step Diagnosis

Trace resolver decisions to identify conflict roots.

sudo apt -o Debug::pkgProblemResolver=yes full-upgrade
Illustrative mockup for ubuntu-24-04-lts β€” unmet_dependencies
APT reports unmet dependencies β€” Illustrative mockup β€” Progressive Robot

Solution – Primary Fix

Unhold blockers, fix broken state, and retry upgrade.

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sudo apt-mark unhold  && sudo apt --fix-broken install && sudo apt full-upgrade
Illustrative mockup for ubuntu-24-04-lts β€” apt_fix_broken
Repairing broken package state β€” Illustrative mockup β€” Progressive Robot

Solution – Alternative Approaches

Temporarily remove conflicting packages and reinstall supported versions.

Verification & Acceptance Criteria

`apt full-upgrade` completes with no unresolved dependencies.

Rollback Plan

Restore previous package holds and repository definitions if instability appears.

Prevention & Hardening

Standardize repository policy and review package holds before maintenance.

Related to mixed PPA priorities and partial release upgrade remnants.

Related tutorial: View the step-by-step tutorial for Ubuntu 24.04 LTS.

View all Ubuntu 24.04 LTS tutorials on the Tutorials Hub β†’

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Ubuntu package dependency and upgrade guidance.

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