You incorrectly modified your /etc/default/grub file:
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash” acpi=force apm=power_off
You should have added the new options inside the quotes. In addition,
you changed the quotes from standard quotes to fancy ones. You must use
the standard ones.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1603868
Title:
package grub-pc 2.02~beta2-36ubuntu3.1 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 127
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