package shim-signed 1.51+15.4-0ubuntu9 failed to install/upgrade: installed shim-signed package post-installation script subprocess returned error exit status 1

When i want to install a decode video software, it is appeared

ProblemType: Package
DistroRelease: Ubuntu 21.04
Package: shim-signed 1.51+15.4-0ubuntu9
ProcVersionSignature: Ubuntu 5.11.0-49.55-generic 5.11.22
Uname: Linux 5.11.0-49-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
.proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] No such file or directory: '/proc/sys/kernel/moksbstate_disabled'
ApportVersion: 2.20.11-0ubuntu65.4
AptOrdering:
 libfdk-aac2:amd64: Install
 gstreamer1.0-fdkaac:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
BootEFIContents:
 BOOTX64.CSV
 grub.cfg
 grubx64.efi
 mmx64.efi
 shimx64.efi
CasperMD5CheckResult: unknown
Date: Sun Jun 5 20:16:55 2022
DpkgHistoryLog:
 Start-Date: 2022-06-05 20:16:29
 Commandline: packagekit role='install-packages'
 Requested-By: nilay (1000)
 Install: libfdk-aac2:amd64 (2.0.1-1, automatic), gstreamer1.0-fdkaac:amd64 (1.18.3-2build1)
EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: EFI variables are not supported on this system.
EFITables:

ErrorMessage: installed shim-signed package post-installation script subprocess returned error exit status 1
Python3Details: /usr/bin/python3.9, Python 3.9.5, python3-minimal, 3.9.4-1
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.20.9ubuntu1
 apt 2.2.4ubuntu0.1
SourcePackage: shim-signed
Title: package shim-signed 1.51+15.4-0ubuntu9 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)