UBUNTU FIX: dpkg: error processing package grub-efi-amd64-signed (–configure):

A solution to dpkg: error processing package grub-efi-amd64-signed (–configure):
installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 127
Errors were encountered while processing:
grub-efi-amd64-signed
E: Sub-process /usr/bin/dpkg returned an error code (1)

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