The error in your log is:
Setting up shim-signed (1.28+0.9+1474479173.6c180c6-1ubuntu1) ...
Instalando para plataforma x86_64-efi.
grub-install: error: no se puede encontrar el directorio EFI.
Why is /boot/efi not mounted on your system? This must be mounted at
package upgrade time in order to install the new versions of the
bootloader.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1691371
Title:
package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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