Ubuntu 18.04 LTS Disk Full on Root Partition

📖 ~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

Applications crash, logging stalls, and updates fail when root partition reaches full capacity.

Environment & Reproduction

Typical on Ubuntu 18.04 with growing logs, cached packages, or orphaned container layers.

Root Cause Analysis

Unbounded log growth and neglected cleanup jobs exhaust available blocks or inodes.

Quick Triage

Run df -h and df -i, identify top consumers, and stop nonessential writes to prevent further impact.

Step-by-Step Diagnosis

Use du sorting on key paths, inspect journal size, and locate deleted-open files via lsof.

Solution – Primary Fix

Purge stale logs and cache safely, rotate aggressively, and reclaim space from orphaned artifacts.

Solution – Alternative Approaches

Extend logical volume or move heavy data paths to dedicated mounts.

Verification & Acceptance Criteria

Free space and inode headroom return above policy and failed services recover fully.

Rollback Plan

Restore deleted data from backup if accidental cleanup removed required assets.

Prevention & Hardening

Enable quota monitoring, log retention policies, and proactive storage alerts.

Related Errors & Cross-Refs

Associated errors include apt failures, MySQL write errors, and systemd journal pressure.

Related tutorial: View the step-by-step tutorial for Ubuntu 18.04 LTS.

View all Ubuntu 18.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Review Linux disk usage analysis, journalctl maintenance, and Ubuntu storage best practices.