Ubuntu 14.04 LTS – system enters GRUB rescue after bootloader issue

📖 ~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

Boot process halts at grub rescue prompt and operating system does not load.

Environment & Reproduction

Typically appears after disk changes, failed upgrades, or partition table edits.

Root Cause Analysis

GRUB cannot locate core modules or target root partition at startup.

Quick Triage

Identify available disks and partitions and verify boot target mapping.

Step-by-Step Diagnosis

Inspect GRUB device paths and partition contents to locate missing references.

Solution – Primary Fix

Reinstall GRUB from rescue media, regenerate config, and set correct boot disk.

Solution – Alternative Approaches

Use manual GRUB commands to boot once and then perform permanent repairs.

Verification & Acceptance Criteria

System boots repeatedly without entering GRUB rescue mode.

Rollback Plan

Revert bootloader layout and partition changes if new config is unstable.

Prevention & Hardening

Document disk mapping and maintain bootloader recovery media readiness.

Related Errors & Cross-Refs

Related errors include unknown filesystem, no such partition, and grub prompt loops.

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

Review Ubuntu GRUB recovery and boot troubleshooting guides.