can't upgrade to 24.04

[Ilan Tal]

I have used Ask Ubuntu with a description of the problem
https://askubuntu.com/questions/1513034/problems-installing-24-04/1513141#1513141

I have a manual partition in order to keep separate the "/" from "/home" and to overwrite the Ubuntu while not touching the user data. The upgrade to 24.04 is failing and I think the reason is that it can't find the grub on the iso file.

ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: grub-efi-amd64-bin 2.06-2ubuntu17.2
ProcVersionSignature: Ubuntu 6.2.0-39.40-generic 6.2.16
Uname: Linux 6.2.0-39-generic x86_64
ApportVersion: 2.26.1-0ubuntu2.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue May 7 12:30:35 2024
InstallationDate: Installed on 2023-11-14 (175 days ago)
InstallationMedia: Ubuntu 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230807.2)
SourcePackage: grub2-unsigned
UpgradeStatus: Upgraded to lunar on 2023-11-14 (174 days ago)