grub2 error: symbol `grub_file_filters' not found

This document (000019919) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 15 SP2 Running on Microsoft Azure

Situation

After upgrading a gen2 VM running on Microsoft Azure to SLES 15 SP2, the system fails to boot and prints the following error to the Azure VM console: 
 
   Loading Linux 5.3.18-24.49-default ...
   error: symbol `grub_file_filters' not found.
   Loading initial ramdisk ...
   error: symbol `grub_file_filters' not found.

   Press any key to continue...
 

Resolution

If the system was rebooted, the issue can be fixed with these steps: 
 
1- Create a recovery disk and set up a SLES15 SP2 gen2 chroot environment as described here:
 
2- Install the secure-boot shim to the recovery disk:
/usr/sbin/shim-install
 
3- Swap out the VM's OsDisk in the Azure Portal WebUI or azure cli with the recovery disk created in step 1:
az vm update -g <resource group> -n <vm name> --os-disk <recovery disk>


If the system was not rebooted after the upgrade, kindly run: 

/usr/sbin/shim-install

Cause

The issue is escalated to SUSE Engineering and Microsoft.

Status

Reported to Engineering

Additional Information

SUSE and Secure Boot: The Details
https://www.suse.com/c/uefi-secure-boot-details/

Change the OS disk used by an Azure VM using the CLI:
https://docs.microsoft.com/en-us/azure/virtual-machines/linux/os-disk-swap

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:000019919
  • Creation Date: 19-Mar-2021
  • Modified Date:22-Mar-2021
    • SUSE Linux Enterprise Server

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