The installer fails to create grub so the system will not boot

[Miguel Eduardo del Canto Pérez]

I don't know, just was installing the new version, replacing Ubuntu 17.10 and this error occurs, saying that the installed software will not be able to boot!

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.12
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Sat Apr 28 18:53:12 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180425.1)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Miguel Eduardo del Canto Pérez (mike2058)]

If my computer will not boot once I reboot it, what can I do? How can I solve this issue?

[dino99 (9d9)]

The error is: Calling 'apt-install grub-efi-amd64-signed' failed

https://askubuntu.com/questions/789998/16-04-new-installation-gives-grub-efi-amd64-signed-failed-installation-target