You have a configuration error in your /etc/default/grub file as you are
using unicode quotes and not ascii quotes. Here is what you have:
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash pcie_aspm=force”
and what you want to have:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force"
Notice how your quotes are slightly sloping up and to the right.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/989193
Title:
package grub-pc 1.99-21ubuntu3 failed to install/upgrade:
ErrorMessage: subprocess installed post-installation script returned
error exit status 127
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