package shim-signed 1.33.1~16.04.6+15+1552672080.a4a1fbe-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128

i keep getting error messages from my system

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: shim-signed 1.33.1~16.04.6+15+1552672080.a4a1fbe-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-193.224-generic 4.4.236
Uname: Linux 4.4.0-193-generic x86_64
.proc.sys.kernel.moksbstate_disabled: 1
ApportVersion: 2.20.1-0ubuntu2.24
Architecture: amd64
Date: Wed Oct 28 01:00:52 2020
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-xenial-amd64-20160624-2
EFITables:
 Out 31 11:35:53 leticia-Inspiron-15-3567 kernel: efi: EFI v2.40 by American Megatrends
 Out 31 11:35:53 leticia-Inspiron-15-3567 kernel: efi: ACPI=0xa8603000 ACPI 2.0=0xa8603000 SMBIOS=0xf0000 SMBIOS 3.0=0xf0020 ESRT=0xa92a9018
 Out 31 11:35:53 leticia-Inspiron-15-3567 kernel: esrt: Reserving ESRT space from 0x00000000a92a9018 to 0x00000000a92a9050.
 Out 31 11:35:53 leticia-Inspiron-15-3567 kernel: Secure boot MOKSBState disabled
ErrorMessage: subprocess installed post-installation script returned error exit status 128
InstallationDate: Installed on 2019-08-05 (453 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
MokSBStateRT: 6 0 0 0 1
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.6
 apt 1.2.32ubuntu0.1
SecureBoot: 6 0 0 0 1
SourcePackage: shim-signed
Title: package shim-signed 1.33.1~16.04.6+15+1552672080.a4a1fbe-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 128
UpgradeStatus: No upgrade log present (probably fresh install)