if [[ ! $GRUB_CMDLINE_LINUX_DEFAULT =~ ibt=[^[:space:]]+ ]]; then
    GRUB_CMDLINE_LINUX_DEFAULT="${GRUB_CMDLINE_LINUX_DEFAULT:+$GRUB_CMDLINE_LINUX_DEFAULT }ibt=off"
fi
if [ -z "${GRUB_DISABLE_OS_PROBER+x}" ]; then
  GRUB_DISABLE_OS_PROBER=false
fi