diskimage-builder/elements/ubuntu/pre-install.d/00-remove-grub

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#!/bin/bash
# The grub post-kernel install hook will barf if the block device can't be
# found (as happens in a chroot).
# Temporarily remove grub, to avoid that confusion.
if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
set -x
fi
set -eu
set -o pipefail
if dpkg-query -W grub-pc; then
apt-get -y remove grub-pc
fi
if dpkg-query -W grub2-common; then
apt-get -y remove grub2-common
fi