package:grub-efi-amd64-signed:1.80+2.02~beta3-4ubuntu2
Setting up shim-signed (1.28+0.9+1474479173.6c180c6-1ubuntu1) ...
Installazione per la piattaforma x86_64-efi.
grub-install: errore: impossibile trovare la directory EFI.
dpkg: error processing package shim-signed (--configure):
 subprocess installed post-installation script returned error exit status 1