π ~1 min read
Table of contents
Symptom & Impact
The server boots to a GRUB shell instead of Ubuntu, causing full service interruption.
Environment & Reproduction
Appears on Ubuntu 14.04 after interrupted package cleanup or bootloader changes.
Root Cause Analysis
GRUB entries reference missing kernel or initrd files under /boot.
Quick Triage
Confirm disk visibility in GRUB and identify the correct root partition.
Step-by-Step Diagnosis
Boot recovery media, mount root, inspect grub.cfg, and validate UUIDs with blkid.
Solution – Primary Fix
Chroot into the system, reinstall grub, run update-grub, and reboot.
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Solution – Alternative Approaches
Use Boot-Repair advanced mode or restore a known-good /boot snapshot.
Verification & Acceptance Criteria
Host reaches multi-user target over multiple reboots and services start normally.
Rollback Plan
Restore previous bootloader files and pin the last known-good kernel.
Prevention & Hardening
Retain at least two kernels and validate reboots after maintenance.
Related Errors & Cross-Refs
Related symptoms include initramfs drops and root UUID mismatch 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
Review Ubuntu GRUB recovery and GNU GRUB administration guidance.
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