On 22/04/2025 09:06, David Wright wrote:
Searching the web with SBAT self check failed turns up several hits, and they range from Windows updating the list of bad signatures
It just mean that you need to download new image and to create a new boot media from it.
If you are sure that you existing boot media is not compromised than you may disable secure boot temporary.
Some vulnerability has been discovered in grub and earlier versions are banned now.