The error in your log is:
Configurazione di grub-efi-amd64-signed (1.66.20+2.02~beta2-36ubuntu3.20)...
grub-install: errore: /usr/lib/grub/i386-pc/modinfo.sh doesn't exist. Please
specify --target or --directory.
dpkg: errore nell'elaborare il pacchetto grub-efi-amd64-signed (--configure):
il sottoprocesso installato script di post-installation ha restituito lo stato
di errore 1
Configurazione di shim (15+1533136590.3beb971-0ubuntu1)...
Configurazione di shim-signed (1.33.1~16.04.4+15+1533136590.3beb971-0ubuntu1)...
Installing for x86_64-efi platform.
grub-install: errore: cannot find EFI directory.
dpkg: errore nell'elaborare il pacchetto shim-signed (--configure):
il sottoprocesso installato script di post-installation ha restituito lo stato
di errore 1
This looks like you have a system that was previously installed in UEFI
mode, but you have removed the ESP from /boot/efi and booted it in BIOS
mode instead. Is this the case? Is there a reason you have done this?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1821513
Title:
package shim-signed 1.33.1~16.04.4+15+1533136590.3beb971-0ubuntu1
failed to install/upgrade: il sottoprocesso installato script di post-
installation ha restituito lo stato di errore 1
To manage notifications about this bug go to:
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