You edited your /etc/default/grub file and modified this line
incorrectly:
GRUB DEFAULT=2
There must be an underscore ( _ ), not a space between GRUB and DEFAULT.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1687181
Title:
package grub-efi-amd64 2.02~beta2-36ubuntu3.9 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 127
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