You somehow got the 32 bit version of grub installed even though you are
running a 64 bit system.  You should remove the 32 bit version:

sudo apt-get remove os-prober:i386 grub-common:i386 grub2-common:i386
grub-pc:i386 grub-pc-bin:i386 grub-gfxpayload-lists:i386

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

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https://bugs.launchpad.net/bugs/1724558

Title:
  package grub-pc:i386 2.02~beta2-36ubuntu3.14 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 10

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