Important data required for Ubuntu launch did not install.

[Orlando Manuel Reynaga Chumpitaz]

The package grub-installer, that is essential to launch the O.S. was not installed correctly during the installation of Linux Ubuntu 16.03 (or 16.04, I cannot verify the version due to being the O.S. recently installed) and a notification popped saying that without that package Ubuntu 16 would not be able to be launched.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.4
ProcVersionSignature: Ubuntu 4.10.0-28.32~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CasperVersion: 1.376.2
Date: Wed Feb 20 23:34:50 2019
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
ProcEnviron:
 LANGUAGE=es_PE.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=es_PE.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)