Hello, based on the following it looks a little like you've selected an EFI install but don't have the correct EFI partitioning. I hope this helps:
Oct 3 13:09:25 ubuntu ubiquity: Setting up grub-efi-amd64-signed (1.93.5+2.02-2ubuntu8.4) ...
Oct 3 13:09:25 ubuntu ubiquity: Instalando para plataforma x86_64-efi.
Oct 3 13:09:25 ubuntu ubiquity: grub-install: error: no se puede encontrar el directorio EFI.
Oct 3 13:09:25 ubuntu ubiquity: dpkg: error processing package grub-efi-amd64-signed (--configure):
Hello, based on the following it looks a little like you've selected an EFI install but don't have the correct EFI partitioning. I hope this helps:
Oct 3 13:09:25 ubuntu ubiquity: Setting up grub-efi- amd64-signed (1.93.5+ 2.02-2ubuntu8. 4) ... amd64-signed (--configure):
Oct 3 13:09:25 ubuntu ubiquity: Instalando para plataforma x86_64-efi.
Oct 3 13:09:25 ubuntu ubiquity: grub-install: error: no se puede encontrar el directorio EFI.
Oct 3 13:09:25 ubuntu ubiquity: dpkg: error processing package grub-efi-