[Bug 1871771] Re: grub2 broken after update

[Sebastien Bacher]

Thank you for your bug report. Do you have any error when upgrading grub?
One known regression from updates on bionic is
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1868138

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https://bugs.launchpad.net/bugs/1871771

Title:
  grub2 broken after update

Status in grub2 package in Ubuntu:
  New

Bug description:
  Hello!
  My environment:
  Windows Server 2016 Standart
  Hyper-V: Сontainer Gen 2: Security Check EFI - Off

  Distribution OS: ubuntu-18.04.3-live-server-amd64.iso
  Distribution OS: xubuntu-18.04.3-desktop-amd64.iso

  My experiments have shown that these packages are the cause of the breakdown:
  grub-efi-amd64-signed amd64 1.93.16+2.02-2ubuntu8.15
  grub-efi-amd64 amd64 2.02-2ubuntu8.15
  grub-efi-amd64-bin amd64 2.02-2ubuntu8.15
  grub2-common amd64 2.02-2ubuntu8.15
  grub-common amd64 2.02-2ubuntu8.15

  With package version 2.02-2ubuntu8.14, everything is fine.
  grub-efi-amd64-signed (1.93.15+2.02-2ubuntu8.14)

  What the breakdown leads to:
  After the reboot, a black bootloader screen appears.

  	GNU GRUB version 2.02
  *Ubuntu
  Advanced options for Ubuntu
  System setup

  Selecting any option returns back to the option selection.
  Starting the kernel manually also returns to the selection of options.
  A clean installation of the OS Ubuntu Server 18.04.3 amd64 during installation installs updates and leads to the same result.
  A clean installation of the OS Xubuntu 18.04.3 works without an Internet connection, but after starting updates on the system itself, the result is the same.

  Common bootloader recovery methods do not help.

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