The error in your log is:
S'està instal·lant per la plataforma x86_64-efi.
grub-install: error: no s'ha trobat el directori EFI.
dpkg: s'ha produït un error en processar el paquet grub-efi-amd64-signed
(--configure):
installed grub-efi-amd64-signed package post-installation script subprocess
returned error exit status 1
Do you have an EFI System Partition on this system? If so, why is it
not mounted at /boot/efi? If not, why are you trying to install grub-
efi-amd64-signed and shim-signed on a system which is not EFI-booting?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1793203
Title:
package shim-signed 1.34.9.2+13-0ubuntu2 failed to install/upgrade:
problemes de dependències - es deixa sense configurar
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