The error in your log is:
Configurando grub-efi-amd64-signed (1.93.7+2.02-2ubuntu8.6) ...
warning: file-aligned section .text extends beyond end of file
warning: checksum areas are greater than image size. Invalid section table?
E: Your kernels are unsigned. This system will fail to boot in a secure boot
environment.
Please show the output of 'ls /boot/vmlinuz*' on this system.
This may be a duplicate of bug #1789918.
** Package changed: shim-signed (Ubuntu) => grub2 (Ubuntu)
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1796076
Title:
package shim-signed 1.37~18.04.2+15+1533136590.3beb971-0ubuntu1 failed
to install/upgrade: problemas de dependencias - se deja sin configurar
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