[Bug 1801534] [NEW] grub menu cannot be hidden when other OS exist

[Wang Xuancong]

Public bug reported:

In /etc/default/grub, despite of setting the following options:
GRUB_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=0
GRUB_TIMEOUT_STYLE=hidden

as long as another OS exists, GRUB menu will always be displayed during
boot.

The reason is because when OS prober is enabled, update-grub will forcefully insert the following 4 lines under session ### BEGIN /etc/grub.d/30_os-prober ### :
set timeout_style=menu
if [ "${timeout}" = 0 ]; then
  set timeout=10
fi

These nullifies options set in /etc/default/grub.

What I want is that I know there are multiple OS in my computer, but
unless I press ESC during boot, I do not want to see the grub menu and
wait for the countdown.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: grub hide menu

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https://bugs.launchpad.net/bugs/1801534

Title:
  grub menu cannot be hidden when other OS exist

Status in grub2 package in Ubuntu:
  New

Bug description:
  In /etc/default/grub, despite of setting the following options:
  GRUB_DEFAULT=0
  GRUB_HIDDEN_TIMEOUT=0
  GRUB_HIDDEN_TIMEOUT_QUIET=true
  GRUB_TIMEOUT=0
  GRUB_TIMEOUT_STYLE=hidden

  as long as another OS exists, GRUB menu will always be displayed
  during boot.

  The reason is because when OS prober is enabled, update-grub will forcefully insert the following 4 lines under session ### BEGIN /etc/grub.d/30_os-prober ### :
  set timeout_style=menu
  if [ "${timeout}" = 0 ]; then
    set timeout=10
  fi

  These nullifies options set in /etc/default/grub.

  What I want is that I know there are multiple OS in my computer, but
  unless I press ESC during boot, I do not want to see the grub menu and
  wait for the countdown.

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