You have modified your /etc/default/grub file and left out the ending
quote on this line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux
acpi_backlight=vendor
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1780149
Title:
package grub-pc 2.02-2ubuntu8.1 failed to install/upgrade: installed
grub-pc package post-installation script subprocess returned error
exit status 2
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