π ~1 min read
Table of contents
Symptom & Impact
System fails to boot into Linux and drops to GRUB rescue shell.
Environment & Reproduction
Common after disk layout changes, failed updates, or bootloader file corruption.
Root Cause Analysis
GRUB cannot locate required modules or root filesystem mapping at startup.
Quick Triage
Identify boot mode, target disk, and whether root partitions are still accessible.
Step-by-Step Diagnosis
Use rescue shell and live media to inspect boot partition and GRUB config.
Solution – Primary Fix
Reinstall and regenerate GRUB from chroot, then validate boot order.
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Solution – Alternative Approaches
Restore from bootloader backups or switch to alternate healthy boot entries.
Verification & Acceptance Criteria
Server boots normally to multi-user target with persistent reboot success.
Rollback Plan
Revert bootloader changes and restore partition table backup if boot remains unstable.
Prevention & Hardening
Capture boot config backups and validate post-update reboot outcomes routinely.
Related Errors & Cross-Refs
Unknown filesystem and file not found in GRUB are typical companion errors.
Related tutorial: View the step-by-step tutorial for Ubuntu 16.04 LTS.
View all Ubuntu 16.04 LTS tutorials on the Tutorials Hub β
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Consult GRUB recovery and Ubuntu boot repair documentation for disaster scenarios.
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