[Bug 1401318] Re: GRUB menu doesn't appear after showing "GRUB loading."

[TJ]

"GRUB loading" message comes from the bootstrap MBR code (the ~440 bytes
in sector 0) of the boot device and is activated whilst shift is
detected.

The boot-strap code then loads GRUB's core image which is what we might
call the real GRUB code, where the $timeout value has an effect.

The only way to prevent bootstrap code from displaying the message is
*not* to be holding down Shift when it loads. Since the time difference
between that point and core image code checking the Shift key flag is
probably in the order of a few millionths of a second its not a viable
workaround :)

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https://bugs.launchpad.net/bugs/1401318

Title:
  GRUB menu doesn't appear after showing "GRUB loading."

Status in grub:
  Unknown
Status in grub2 package in Ubuntu:
  Triaged

Bug description:
  I'm using Ubuntu 15.04 dev with grub-pc 2.02~beta2-18 and this bug was
  already reported on upstream but they requested to report it to the
  related distribution: http://savannah.gnu.org/bugs/?40853

  Summary:

  It is not possible to configure GRUB anymore to automatically boot
  instantly to the default operating system in a multi-system
  environment while having the ability to show the GRUB menu if the
  related button (shift on my system) is keeping pressed while booting.

  In comment #2 of the upstream report is an example configuration how
  to reproduce this behavior. Keeping shift pressed while booting does
  then show "GRUB loading." but the GRUB menu will not appear. Instead
  GRUB will immediately boot to the default operating system.

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