The error in your log is:
> Searching for GRUB installation directory ... found: /boot/grub
> /etc/default/grub: lĂnea 11: splash: orden no encontrada
> run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 127
This indicates that you have modified /etc/default/grub in a way that
means it is no longer a valid shell script. This is not a bug in
Ubuntu. You will need to correct this file and repeat the upgrade.
** Package changed: grub (Ubuntu) => grub2 (Ubuntu)
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1617554
Title:
package linux-image-generic 4.4.0.34.36 failed to install/upgrade:
run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return
code 127
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