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
Hello!
No error.
On the OS xubuntu-18.04.3-desktop-amd64, I solved the problem.
After copying the old EFI to the outcrops of the GRUB, through a live disk.
In device /dev/sda1 EFI System
The operating system has worked as it should.
On the OS ubuntu-18.04.3-live-server-amd64, I have not tried it
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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