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
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