π ~1 min read
Table of contents
Symptom & Impact
System fails to reach kernel boot stage, causing full service outage.
Environment & Reproduction
Can occur after interrupted grub package upgrade or disk mapping changes.
Root Cause Analysis
GRUB core image or configuration references invalid paths and cannot locate boot assets.
Quick Triage
Determine disk layout and confirm whether boot partition remains intact.
Step-by-Step Diagnosis
Use rescue media to inspect boot files, partition UUIDs, and grub.cfg integrity.
Solution – Primary Fix
Reinstall GRUB to correct device, regenerate config, and validate boot entries.
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Solution – Alternative Approaches
Restore from image backup or chainload temporary recovery kernel entry.
Verification & Acceptance Criteria
Host boots cleanly and survives reboot tests without GRUB rescue prompts.
Rollback Plan
Revert to previous boot disk snapshot if reinstall process fails.
Prevention & Hardening
Protect bootloader updates with maintenance windows and verified backup strategy.
Related Errors & Cross-Refs
grub rescue unknown filesystem and no such partition errors.
Related tutorial: View the step-by-step tutorial for Ubuntu 14.04 LTS.
View all Ubuntu 14.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
GRUB recovery procedures and Ubuntu boot troubleshooting documentation.
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