Pretty sure this bug was inadvertently fixed.
None of these mention GRUB_DEFAULT at all:
grub-reboot --help
man grub-reboot
info grub-reboot
** Changed in: grub2 (Ubuntu)
Status: Fix Released => Confirmed
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https://bugs.launchpad.net/bugs/704406
Title:
grub-reboot should warn that default=saved is required
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