package shim-signed 1.41+15+1552672080.a4a1fbe-0ubuntu1 failed to install/upgrade: o subprocesso instalado, do pacote shim-signed, o script post-installation retornou erro do status de saída 1

[Marcos Nascimento]

This error occurred during system upgrade.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: shim-signed 1.41+15+1552672080.a4a1fbe-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
Uname: Linux 5.4.0-12-generic x86_64
.proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] Arquivo ou diretório inexistente: '/proc/sys/kernel/moksbstate_disabled'
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
Date: Wed Feb 12 04:13:54 2020
EFITables:
 fev 11 14:54:10 Deskpro-01 kernel: efi: EFI v2.00 by American Megatrends
 fev 11 14:54:10 Deskpro-01 kernel: efi: ACPI 2.0=0xcbe5ff98 SMBIOS=0xcbe8ae18
 fev 11 14:54:10 Deskpro-01 kernel: secureboot: Secure boot could not be determined (mode 0)
 fev 11 14:54:10 Deskpro-01 kernel: secureboot: Secure boot could not be determined (mode 0)
 fev 11 14:54:21 Deskpro-01 fstrim[810]: /boot/efi: 196,9 MiB (206472704 bytes) trimmed on /dev/sda1
ErrorMessage: o subprocesso instalado, do pacote shim-signed, o script post-installation retornou erro do status de saída 1
InstallationDate: Installed on 2020-02-01 (11 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200124)
Python3Details: /usr/bin/python3.7, Python 3.7.6, python3-minimal, 3.7.5-1ubuntu1
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu2
 apt 1.9.9
SourcePackage: shim-signed
Title: package shim-signed 1.41+15+1552672080.a4a1fbe-0ubuntu1 failed to install/upgrade: o subprocesso instalado, do pacote shim-signed, o script post-installation retornou erro do status de saída 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Steve Langasek (vorlon)]

The error in your log is:

Configurando shim-signed (1.41+15+1552672080.a4a1fbe-0ubuntu1) ...
Instalando para a plataforma x86_64-efi.
grub-install: aviso: Cannot set EFI variable BootOrder.
grub-install: aviso: efivarfs_set_variable: writing to fd 8 failed: Argumento inválido.
grub-install: aviso: _efi_set_variable_mode: ops->set_variable() failed: Argumento inválido.
grub-install: erro: failed to register the EFI boot entry: Argumento inválido.
dpkg: erro ao processar o pacote shim-signed (--configure):
What does 'efibootmgr -v' show on this system?