You added the following invalid line to your /etc/default/grub file:
GRUB CMDLINE LINUX="acpi.power nocheck=1"
You will need to remove that.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1718383
Title:
package grub-pc 2.02~beta2-9ubuntu1.14 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 127
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