📖 ~1 min read
Table of contents
Symptom & Impact
System boots to grub rescue> and Ubuntu does not start.
Environment & Reproduction
Often follows interrupted grub or EFI package updates.
Root Cause Analysis
Broken GRUB core image or incorrect EFI boot entry path.
Quick Triage
From live media, identify root and EFI partitions with lsblk -f.
Step-by-Step Diagnosis
Mount target filesystem and inspect /boot/efi/EFI/ubuntu plus /etc/fstab UUID values.
Solution – Primary Fix
Chroot and run sudo grub-install –target=x86_64-efi –efi-directory=/boot/efi –bootloader-id=ubuntu && sudo update-grub.
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Solution – Alternative Approaches
Use Boot-Repair from Ubuntu live session when manual install is not practical.
Verification & Acceptance Criteria
System boots normally and grub menu detects Ubuntu kernels.
Rollback Plan
Restore previous EFI entry via firmware setup if new entry fails.
Prevention & Hardening
Do not interrupt bootloader updates and keep EFI partition healthy.
Related Errors & Cross-Refs
Related: ‘unknown filesystem’ and missing normal.mod errors.
Related tutorial: View the step-by-step tutorial for Ubuntu 24.04 LTS.
View all Ubuntu 24.04 LTS tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Ubuntu GRUB wiki and UEFI boot repair documentation.
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