[Bug 1863434] Re: 20.04 grub menu not visible

[iononsbalgiomai]

Same problem here. My computer is an Acer E1-571 with the latest firmware update.
Here the data sheet: https://www.acer.com/datasheets/2012/4876/E1-571/NX.M09ET.005.html

With Bionic, Grub 2.02 correctly recognise Windows 10 and show the Grub menu.
Also with Focal, Grub 2.04 correctly recognise Windows 10 but not show the Grub menu.

I've found 3 workaround:
1) Downgrade Grub 2.04 to 2.02 using the deb packages present in the Bionic repositories or upgrade to 2.06 from sources.
2) Enable the `console` mode (remove the "#" from `#GRUB_TERMINAL=console` in `/etc/defautl/grub`), but this disables graphics themes.
3) Disable Secure Boot and use `efibootmgr` to set the "grubx64.efi" boot entry as first.

With Secure Boot enabled, the boot is possible only via the
"shimx64.efi" boot entry. If the boot is from this entry, the Grub menu
is visible only in console mode. The same if Secure Boot is disabled, so
the problem is not Secure Boot. The same downgrading Shim Signed to 1.37
version, from the Bionic repositories, so the problem is not Shim.

In Ubuntu Bionic (that use Grub 2.02, Shim Signed 1.37 and show the
graphics Grub menu out of the box) I upgrade Shim Signed to 1.40, the
Focal version, and the Grub menu is still showed in graphics mode,
regardless of Secure Boot. This confirm the problem is not Shim or
Secure Boot, but Grub 2.04 on Focal (and maybe Groovy and Hirsute).

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https://bugs.launchpad.net/bugs/1863434

Title:
  20.04 grub menu not visible

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  T430
  Ubuntu MATE 20.04

  New installation.

  After initial boot there is a blank black screen where grub should be visible.
  Grub is functional but not visible.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: grub-common 2.04-1ubuntu18
  ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
  Uname: Linux 5.4.0-14-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu16
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Sat Feb 15 09:19:13 2020
  InstallationDate: Installed on 2020-02-14 (0 days ago)
  InstallationMedia: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Alpha amd64 (20200214)
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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