package shim-signed 1.40.3+15+1533136590.3beb971-0ubuntu1 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1

1)Riporto il messaggio di errore ricevuto durante il primo avvio di avanzamento di versione:
Pacchetto "SHIM-SIGNED" potrebbe non essere in uno stato funzionanate. Segnalare questo evento come bug;

2)Riporto messaggio di errore ricevuto durante il secondo tentativo di avanzamento di versione parziale: "Configerazione in corso di shim-signed"
installazione GRUB sul device di avvio toshiba ---- non riuscita

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: shim-signed 1.40.3+15+1533136590.3beb971-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
.proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] File o directory non esistente: '/proc/sys/kernel/moksbstate_disabled'
ApportVersion: 2.20.11-0ubuntu27.6
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sat Aug 8 07:34:43 2020
EFITables:
 ago 08 10:03:18 maxx-desktop kernel: efi: EFI v2.31 by American Megatrends
 ago 08 10:03:18 maxx-desktop kernel: efi: ACPI=0x9c1a2000 ACPI 2.0=0x9c1a2000 SMBIOS=0xf04d0 MPS=0xfd570
 ago 08 10:03:18 maxx-desktop kernel: secureboot: Secure boot disabled
 ago 08 10:03:18 maxx-desktop kernel: secureboot: Secure boot disabled
ErrorMessage: installed shim-signed package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2019-08-28 (345 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.1
SecureBoot: 22 0 0 0 0
SourcePackage: shim-signed
Title: package shim-signed 1.40.3+15+1533136590.3beb971-0ubuntu1 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)