[Bug 2080785] Re: GRUB menu doesn't show with os-prober entries on BIOS

[udippel]

I had to set it to 'New', since it showed not to be an "opinion" after a
weekend of installations.

Among others, I had to install 24.04.1 to two different machines that so far only had W10 installed. After installation, both machines did not show any choice of OS at boot, and straightforwardly booted into kubuntu. 
In both cases I encountered a default grub of 

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR='Kubuntu'
GRUB_CMDLINE_LINUX_DEFAULT='quiet splash resume=UUID=b2e084d0-2cce-4cad-ba48-ed13be62e0b0'
GRUB_CMDLINE_LINUX=""

"hidden" as style and "0" as timeout are as invasive as possible: "no selection menu" (by "hidden"), and no selection menu another time through 0 seconds of timeout. Just moving these parameters to "menu" and "10" brought up a proper grub boot selection menu in both cases. 
I can see no proper reason to forcibly EXCLUDE any chance to boot to the previously installed W10. That is what these two default setting unfortunately do. 
I reiterate my position that this is a bug, and the default settings ought to be selected such that - circumstances (UEFI, BOOT) allowing - the user can actually select between the OSes.

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https://bugs.launchpad.net/bugs/2080785

Title:
  GRUB menu doesn't show with os-prober entries on BIOS

Status in grub2 package in Ubuntu:
  New

Bug description:
  #GRUB_TIMEOUT_STYLE=hidden 
  has been default setting for at least a decade, also here on my various machines with multiple OSes. It did work in a reasonable manner: (wiki.ubuntuusers.de/GRUB_2/Konfiguration) "Die Einstellung hidden bzw. countdown wird ignoriert und das GRUB-Menü immer angezeigt, wenn mehr als ein Betriebssystem von GRUB verwaltet wird." (With more than one OSes being bootable through grub, the setting 'hidden' will be ignored).
  This made sense for single OSes (no need to show, and if, with Esc), as well as with multiple OSes (showing the OS that is going to come up). With my recent update (release), suddenly no more grub menu showed. 
  According to https://askubuntu.com/questions/1526795/grub-menu-doesnt-show-any-longer one had to set this grub variable to "menu". Immediately the grub menu popped up again. 
  All the hassle around this would have been unnecessary without the changed behaviour of grub with the identical variable. (While this change could be questioned, this is not my concern here.)

  It is an unnecessary bug behaviour to change items with the identical
  parameter. For security and user convenience, either the grub default
  ought to have been set to the 'safe' (no loss of OS) value of "menu",
  or a new parameter introduced; keeping the behaviour of existing
  parameters as such (and eventually only withdrawn after extended times
  of deprecation, if at all).

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: grub2-common 2.12-1ubuntu7
  ProcVersionSignature: Ubuntu 6.8.0-44.44-generic 6.8.12
  Uname: Linux 6.8.0-44-generic x86_64
  ApportVersion: 2.28.1-0ubuntu3.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Sun Sep 15 18:27:31 2024
  InstallationDate: Installed on 2021-08-07 (1135 days ago)
  InstallationMedia: Kubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
  SourcePackage: grub2
  UpgradeStatus: Upgraded to noble on 2024-08-30 (16 days ago)
  mtime.conffile..etc.init.d.apport: 2024-07-22T16:59:07

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