# GRUB on the instance's host at home (ADR 0039, D20), as /etc/default/grub.d/halkyon.cfg:
# its menu shown for 5 seconds, so that at the iMac the way back (grub-dracut-fallback)
# can be chosen, and the boot in text, without a splash: no desktop, and the
# passphrase's prompt is plain on the screen as over SSH.
GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=5
GRUB_CMDLINE_LINUX_DEFAULT=""