user@ubuntu:~$ journalctl -xe | grep "error: symbol 'grub_efi_secure_boot' not found"

Critical

error: symbol 'grub_efi_secure_boot' not found_ (Ubuntu)

error: symbol 'grub_efi_secure_boot' not found

Ubuntu · Boot/GRUB

The error error: symbol 'grub_efi_secure_boot' not found on Ubuntu indicates a specific failure categorized as "error: symbol 'grub_efi_secure_boot' not found" under Boot/GRUB. This guide walks you through the most likely causes and the correct fix order.

What Actually Happened

System boot halted: the installed GRUB binary is out of sync with the shim/Secure Boot chain after a partial update.

Symptoms

Linux boot halted with message: 'error: symbol 'grub_efi_secure_boot' not found'

Common Causes

Boot condition: the installed GRUB binary is out of sync with the shim/Secure Boot chain after a partial update

How to Fix It

01
Boot from a Live USB media
02
Chroot into installation and run:
sudo update-grub
03
Reinstall bootloader:
sudo grub-install /dev/sda

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