Your log looks very strange. Did you interrupt the upgrade process and
then try to run gedit /etc/default/grub?
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1590313
Title:
package grub-efi-ia32 2.02~beta2-36ubuntu3 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 1
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