diskimage-builder/diskimage_builder/elements/grub2/install.d/02-grub-install-spec

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#!/bin/bash
if [ ${DIB_DEBUG_TRACE:-1} -gt 0 ]; then
set -x
fi
set -eu
set -o pipefail
# grub-efi-amd64-signed in ubuntu post will try to call grub-efi-amd64 to install grub into root
# device which definitely fail at this stage
# the workaround is to skip error and remove postinst script
if [[ "ubuntu" =~ "$DISTRO_NAME" ]]; then
if ! install-packages grub-efi-amd64-signed; then
rm -f /var/lib/dpkg/info/grub-efi-amd64-signed.postinst
rm -f /var/lib/dpkg/info/grub-efi-amd64.postinst
fi
dpkg --configure grub-efi-amd64
dpkg --configure grub-efi-amd64-signed
fi