[Bug 1898022] Re: grub upgrade 18.04->20.04 loses dual-boot to W10

[udippel]

Since 24.04 is really non-workable on this Lenovo thinkpad (see my other
reports), and I am a curious person, I downloaded 18.04, wiped the disk
completely, reinstalled W10 followed by kubuntu 18.04, and found
everything to be working as expected. I did the same, yet another time,
and installed 24.04. And encountered all my grouses once again. Finally
I did everything for the third time, again with 18.04, and found
everything to be okay.

Since the non-volatile UEFI had run full after about the third reboot
with 24.04 (which it hadn't done for the last 5+ years), and it doesn't
shut down properly, neither with the installation media, 2085732 nor
from an installation, #2078572, I am by now pretty convinced that the
underlying problem could be Ubuntu's handling of UEFI; at least on this
hardware. W10 runs perfectly okay, and for some hours now 18.04, too.
Especially no shutdown/reboot worries; and the grub menu shows, when the
machine is set to use the hard disk as first boot device.

Therefore, we should assume by now that grub does a proper job; and the
major problems as encountered are problems introduced at some moment by
ubuntu in the UEFI-handling.

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https://bugs.launchpad.net/bugs/1898022

Title:
  grub upgrade 18.04->20.04 loses dual-boot to W10

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  (Summary says it:)

  Upgraded by dual-boot kubuntu 18.04 to kubuntu 20.04. After the restart, dual-boot was gone, and it boots directly into kubuntu. 
  I guess it is a problem with grub, because the boot menu doesn't show. However, the 'lenovo' shows trice, while it used to show once with 18.04; followed by the grub boot menu. 

  I guess that the MBR was written into haywire?

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: grub-efi-amd64-bin 2.04-1ubuntu26.4
  ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
  Uname: Linux 5.4.0-48-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.9
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Thu Oct  1 11:34:39 2020
  InstallationDate: Installed on 2019-03-14 (566 days ago)
  InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  SourcePackage: grub2
  UpgradeStatus: Upgraded to focal on 2020-09-29 (1 days ago)

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