You are specifically missing a double quote at the beginning of this
line:

GRUB_CMDLINE_LINUX_DEFAULT=quiet splash acpi_osi=Linux
acpi_backlight=vendor splash"

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https://bugs.launchpad.net/bugs/1010928

Title:
  package grub-pc 1.99-21ubuntu3.1 failed to install/upgrade: le sous-
  processus script post-installation installé a retourné une erreur de
  sortie d'état 2

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