The error in your log is:
Configurando grub-efi-amd64-signed (1.93.4+2.02-2ubuntu8.3) ...
Instalando para a plataforma x86_64-efi.
grub-install: erro: cannot find EFI directory.
dpkg: erro ao processar o pacote grub-efi-amd64-signed (--configure):
installed grub-efi-amd64-signed package post-installation script subprocess
returned error exit status 1
dpkg: problemas com dependências impedem a configuração de shim-signed:
shim-signed depende de grub-efi-amd64-signed; porém:
Pacote grub-efi-amd64-signed não está configurado ainda.
dpkg: erro ao processar o pacote shim-signed (--configure):
problemas de dependência - deixando desconfigurado
Is this system running in EFI mode? If so, why is /boot/efi not
mounted?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1809149
Title:
package shim-signed 1.37~18.04.3+15+1533136590.3beb971-0ubuntu1 failed
to install/upgrade: problemas de dependência - deixando desconfigurado
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