[Bug 1871771] Re: grub2 broken after update

[Vitalii Rudiiko]

Hello!
I'll start with the most important thing.

Solution to the problem:
1. Boot through a live CD.
	I am using the xubuntu-18.04.3-desktop-amd64.iso

2. Open the terminal.
	sudo mount /dev/sda1 /mnt
	sudo rm /mnt/EFI/ubuntu/grubx64.efi
	sudo cp /cdrom/EFI/BOOT/grubx64.efi /mnt/EFI/ubuntu/
	sudo reboot

3. Press "Enter" the bootloader GRUB menu on *Ubuntu.
	The system starts to boot.
	
The cause of the problem:
After updating the bootloader GRUB (2.02-2ubuntu8.15), the file grubx64.efi changes.
The size of the broken file: 1116536 bytes.
Size of the working file from live CD: 1146744 bytes.
This file is on the /dev/sda1 (EFI System). Path EFI/ubuntu/grubx64.efi.

Recovery method tested on:
Distribution OS: ubuntu-18.04.3-live-server-amd64.iso
Distribution OS: ubuntu-18.04.4-live-server-amd64.iso
Distribution OS: xubuntu-18.04.3-desktop-amd64.iso

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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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