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(grub.info)fallback

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fallback
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 - Command: fallback num
     Go into unattended boot mode: if the default boot entry has any
     errors, instead of waiting for the user to do anything,
     immediately start over using the NUM entry (same numbering as the
     `default' command (Note: default)). This obviously won't help if
     the machine was rebooted by a kernel that GRUB loaded.