Ubuntu 14.04 LTS GRUB Rescue Prompt After Disk Changes

📖 ~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

Server cannot boot normally and stops at grub rescue shell awaiting manual commands.

Environment & Reproduction

Common after partition edits, disk cloning, or UUID changes.

Root Cause Analysis

Bootloader references stale disk identifiers or missing core image path.

Quick Triage

Locate valid root and boot partitions from rescue shell before reinstall.

Step-by-Step Diagnosis

Boot from live media, mount root, and verify /boot/grub structure and UUID consistency.

Solution – Primary Fix

Chroot into system and reinstall grub with fresh config generation.

Solution – Alternative Approaches

Use boot repair tooling where policy permits and validate resulting menu entries.

Verification & Acceptance Criteria

Host boots unattended to operating system and all kernel entries are valid.

Rollback Plan

Restore previous bootloader backup image if reinstall introduces additional failures.

Prevention & Hardening

Snapshot partition metadata before storage changes and test boot path after maintenance.

Related Errors & Cross-Refs

unknown filesystem, no such partition, and file not found in GRUB.

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

GNU GRUB manual and Ubuntu recovery mode documentation.