[18.04.4] System boots in insecure mode after an installation with SB on

[Jean-Baptiste Lallement]

Ubuntu Desktop 20200203.1
Dell Inspiron 7472
UEFI with SB On

After installation and enrolling the keys the machine boots in insecure mode.

It works as expected on a Dell Inspiron 5378

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-5.3.0-28-generic 5.3.0-28.30~18.04.1
ProcVersionSignature: Ubuntu 5.3.0-28.30~18.04.1-generic 5.3.13
Uname: Linux 5.3.0-28-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Feb 4 12:10:49 2020
InstallationDate: Installed on 2020-02-04 (0 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
SourcePackage: linux-signed-hwe
UpgradeStatus: No upgrade log present (probably fresh install)

[Jean-Baptiste Lallement (jibel)]

Installer logs