package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 30

Processor Intel® Core™ i3-6006U CPU @ 2.00GHz × 4
Device Name slm-Inspiron-15-3567
Memory 7,7 GiB
Graphics Intel® HD Graphics 520 (Skylake GT2)
OS type 64-bit
Disk 964,6 GB

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: shim-signed 1.34.9+13-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
.proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] No such file or directory: '/proc/sys/kernel/moksbstate_disabled'
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
Date: Thu May 10 02:52:48 2018
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-xenial-amd64-20160624-2
EFITables:
 Mai 14 13:06:26 slm-Inspiron-15-3567 kernel: efi: EFI v2.40 by American Megatrends
 Mai 14 13:06:26 slm-Inspiron-15-3567 kernel: efi: ACPI=0xa85fc000 ACPI 2.0=0xa85fc000 SMBIOS=0xf0000 SMBIOS 3.0=0xf0020 ESRT=0xa92e1018
 Mai 14 13:06:26 slm-Inspiron-15-3567 kernel: secureboot: Secure boot disabled
 Mai 14 13:06:26 slm-Inspiron-15-3567 kernel: esrt: Reserving ESRT space from 0x00000000a92e1018 to 0x00000000a92e1050.
ErrorMessage: installed shim-signed package post-installation script subprocess returned error exit status 30
InstallationDate: Installed on 2017-12-25 (140 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
MokSBStateRT: 6 0 0 0 1
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.1
SecureBoot: 6 0 0 0 1
SourcePackage: shim-signed
Title: package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 30
UpgradeStatus: Upgraded to bionic on 2018-05-10 (4 days ago)