Comment # 13 on bug 1185441 from Gary Ching-Pang Lin

(In reply to Tiago Marques from comment #12)
> Hi,
> 
> I've been hit by this for some months now. Every Grub2 update, I get the
> same message as OP.
> Not sure which grub package is to blame and I'm using EFI and secure boot.
> 
> I've managed to (twice) solve the issue by booting a live USB, chrooting and
> then running 'shim-install'.
> 
> Not sure where the bug is or if this helps. I'm available to test other
> things out to help fix this.

Before upgrading "shim", could you try "mokutil --enable-validation" and reboot
the system to clean up MokSBState?