Ubuntu 20.04 LTS No Space Left on Device During apt Upgrade

📖 ~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

Package operations fail because root or /var partition is out of space.

Environment & Reproduction

Ubuntu 20.04 LTS with small virtual disks and accumulated caches/logs.

Root Cause Analysis

Insufficient free space for unpacking new packages and writing metadata.

Quick Triage

Identify largest consumers under /var, /tmp, and package cache paths.

Step-by-Step Diagnosis

Analyze filesystem usage and package cache footprint before cleanup.

Solution – Primary Fix

Clear apt cache, rotate logs, and remove obsolete kernels safely.

Solution – Alternative Approaches

Extend logical volume or attach larger disk for sustained growth.

Verification & Acceptance Criteria

apt upgrade completes with healthy free space reserve afterward.

Rollback Plan

Recover removed packages from backup repositories if needed.

Prevention & Hardening

Automate disk usage alerts and routine cleanup policies.

Related Errors & Cross-Refs

Related to journal growth and tmpfs saturation incidents.

Related tutorial: View the step-by-step tutorial for Ubuntu 20.04 LTS.

View all Ubuntu 20.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

See apt cache management and Ubuntu storage administration guides.