Thanks for your bug report.
It seems you changed one line in /etc/default/grub to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" "acpi=off"
meaning that "acpi=off" is considered a program to run (and
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" an environment variable to
pass to it).
Please change the line to remove the spurious quotes and space in the
middle so it says
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off"
I marked the bug as incomplete, as I can't be sure it's not a bug in
some maintainer script trying to rewrite the file, I think we saw some
of them. Please let us know if you did not cause this!
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1929440
Title:
package grub-pc 2.04-1ubuntu26.11 failed to install/upgrade: installed
grub-pc package post-installation script subprocess returned error
exit status 127
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