$ sudo dpkg --configure -a
Setting up grub-efi-amd64-signed (1.93.14+2.02-2ubuntu8.13) ...
Installing for x86_64-efi platform.
grub-install: error: efibootmgr failed to register the boot entry: Unknown error -1.
dpkg: error processing package grub-efi-amd64-signed (--configure):
 installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 grub-efi-amd64-signed