Seems like your /etc/default/grub is corrupt, please double check that.
** Changed in: grub2-unsigned (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/2112458
Title:
package grub-efi-amd64 2.12-1ubuntu7.3 failed to install/upgrade:
installed grub-efi-amd64 package post-installation script subprocess
returned error exit status 127
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