Well, the error that pops up is because you've installed the grub
package on your system without configuring it, and this package is
deprecated.
You should remove it again with 'sudo apt --purge grub'.
** Changed in: grub (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1795793
Title:
package linux-image-4.15.0-36-generic 4.15.0-36.39~16.04.1 failed to
install/upgrade: run-parts: /etc/kernel/postinst.d/zz-update-grub
exited with return code 1
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