I made a strace for the installation process and find the following
error in a subprocess, which seems to be the cause.
strace -qf -o /tmp/grub_installation.log dpkg --configure grub-efi-
** Attachment added: "Strace log extract for the dpkg --configure strace -qf -o
/tmp/grub_installation.log dpkg --configure grub-efi-amd64-signed"
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package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 failed to
install/upgrade: installed grub-efi-amd64-signed package post-
installation script subprocess returned error exit status 1
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