🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026

📖 ~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

Upgrades stop with unmet dependency messages; key packages remain unconfigured and system updates stall.

Environment & Reproduction

Seen after release upgrades, mixed PPAs, or interrupted package transactions on Ubuntu 26.04 LTS.

Root Cause Analysis

Conflicting versions or third-party repository packages break apt solver assumptions and leave partial dpkg state.

Quick Triage

Do not reboot repeatedly. Stabilize package manager state first.

Step-by-Step Diagnosis

Use `sudo apt –fix-broken install`, `sudo dpkg –audit`, and `apt-cache policy ` to identify version conflicts and repository priorities.

Illustrative mockup for ubuntu-26-04-lts — ubuntu2604_b01_p03_diag
Finding broken package dependency chains — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Remove conflicting packages/PPA versions, run `sudo dpkg –configure -a`, then complete repair via `sudo apt -f install` and targeted reinstall.

Still having issues? Our IT Solutions & Services team can diagnose and resolve this for you. Get in touch for a free consultation.

Illustrative mockup for ubuntu-26-04-lts — ubuntu2604_b01_p03_fix
Repairing package graph with apt and dpkg tools — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Pin package priorities with apt preferences or temporarily disable problematic repositories until compatible builds are available.

Verification & Acceptance Criteria

`sudo apt upgrade` exits cleanly, `dpkg –audit` is empty, and held broken packages are resolved.

Rollback Plan

Re-enable prior snapshot or remove only recent package changes using apt history logs in `/var/log/apt/`.

Prevention & Hardening

Minimize unvetted PPAs, validate repo compatibility before major upgrades, and test in staging.

`Depends: … but it is not going to be installed`, `held broken packages`, and dpkg configure failures.

Related tutorial: View the step-by-step tutorial for Ubuntu 26.04 LTS.

View all Ubuntu 26.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Ubuntu release upgrade notes, apt pinning docs, and `man apt-cache`.

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