You have incorrectly modified your /etc/default/grub file. These lines
need to be one line, with the quotes at the start end end of the
options:
GRUB_CMDLINE_LINUX_DEFAULT= acpi=off apm=off
"quiet splash"
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1512148
Title:
package grub-pc 2.02~beta2-9ubuntu1.4 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 127
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