[Bug 1401318] Re: GRUB menu doesn't appear after showing "GRUB loading."
ubuntu at iam.tj
Sun May 15 22:54:01 UTC 2016
"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
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
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GRUB menu doesn't appear after showing "GRUB loading."
Status in grub:
Status in grub2 package in Ubuntu:
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
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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