The error in your log is:

Configurazione di shim-signed (1.5~12.04.1+0.4-0ubuntu4)...
Unrecognized option `--target=x86_64-efi'

I'm not sure why you're getting this error.  This version of shim-signed
does not pass --target=x86_64-efi to grub-install.

 il sottoprocesso vecchio script di post-installation ha restituito lo
stato di errore 1

I also don't know why the old postinst script is being called here,
without the new one being called.

It's possible the shim-signed package has not been properly unpacked on
your system and that there's some kind of filesystem corruption in place
here.  Can you try to run the following command from a terminal to see
if it resolves the error?

  sudo apt-get install --reinstall shim-signed

** Changed in: shim-signed (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1290206

Title:
  package shim-signed 1.5~12.04.1+0.4-0ubuntu4 failed to
  install/upgrade: il sottoprocesso vecchio script di post-installation
  ha restituito lo stato di errore 1

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