You have mucked up your /etc/default/grub file:

GRUB_TIMEOUT=0"10" << that extra leading 0 should not be there
GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null || echo Debian`" << those 
double quotes should not be there


** Changed in: grub2 (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1395380

Title:
  package grub-pc 2.02~beta2-15 failed to install/upgrade: le sous-
  processus script post-installation installé a retourné une erreur de
  sortie d'état 2

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