Ubuntu 14.04 LTS – swap partition not activating at boot

📖 ~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 runs without swap, increasing risk of OOM under memory spikes.

Environment & Reproduction

Can happen after partition changes, UUID drift, or fstab misconfiguration.

Root Cause Analysis

Swap entry in fstab is invalid or target device is unavailable at boot.

Quick Triage

Check active swap devices and compare against configured UUID/path entries.

Step-by-Step Diagnosis

Validate swap signature, fstab syntax, and boot-time device readiness.

Solution – Primary Fix

Correct swap mapping, recreate swap signature if needed, and re-enable at startup.

Solution – Alternative Approaches

Create a swapfile as interim mitigation when partition repair is delayed.

Verification & Acceptance Criteria

Swap is active after reboot and memory pressure handling behaves normally.

Rollback Plan

Restore previous swap config or remove temporary swapfile if conflicts occur.

Prevention & Hardening

Validate fstab changes automatically and monitor swap activation state.

Related Errors & Cross-Refs

Related messages include swapon failed and bad swap UUID warnings.

Related tutorial: View the step-by-step tutorial for Ubuntu 14.04 LTS.

View all Ubuntu 14.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Consult Ubuntu swap management and VM tuning documentation.