[Bug 2080785] Re: Wrong defaults after (deprecated) changes: #GRUB_TIMEOUT_STYLE

[udippel]

"The proof of the pudding is in the eating"
I reverted the change, so that said line once again reads 
#GRUB_TIMEOUT_STYLE=hidden
, nothing else but sudo update-grub, which did find the W10 partition:

$ sudo update-grub
[sudo] password for udippel: 
Sourcing file `/etc/default/grub'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-6.8.0-44-generic
Found initrd image: /boot/initrd.img-6.8.0-44-generic
Found linux image: /boot/vmlinuz-6.8.0-41-generic
Found initrd image: /boot/initrd.img-6.8.0-41-generic
Found memtest86+x64 image: /memtest86+x64.bin
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Found Windows 10 on /dev/sda1
Adding boot menu entry for UEFI Firmware Settings ...
done

Rebooted, and once again no grub menu.

$ dpkg -l | grep grub
ii  grub-common                                              2.12-1ubuntu7                               amd64        GRand Unified Bootloader (common files)
ii  grub-gfxpayload-lists                                    0.7build2                                   amd64        GRUB gfxpayload blacklist
ii  grub-pc                                                  2.12-1ubuntu7                               amd64        GRand Unified Bootloader, version 2 (PC/BIOS version)
ii  grub-pc-bin                                              2.12-1ubuntu7                               amd64        GRand Unified Bootloader, version 2 (PC/BIOS modules)
ii  grub-theme-breeze                                        5.27.11-0ubuntu2                            amd64        Breeze theme for GRUB 2
ii  grub2-common                                             2.12-1ubuntu7                               amd64        GRand Unified Bootloader (common files for version 2)

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

Title:
  Wrong defaults after (deprecated) changes: #GRUB_TIMEOUT_STYLE

Status in grub2 package in Ubuntu:
  Incomplete

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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