package linux-firmware 1.187.6 failed to install/upgrade: installed linux-firmware package post-installation script subprocess returned error exit status 1

[Lucien SAMUEL]

Migrating from 18.04.05 to 20.04.1

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: linux-firmware 1.187.6
ProcVersionSignature: Ubuntu 5.4.0-56.62-generic 5.4.73
Uname: Linux 5.4.0-56-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.13
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: ba03346 2279 F.... pulseaudio
 /dev/snd/controlC0: ba03346 2279 F.... pulseaudio
CasperMD5CheckResult: skip
Date: Thu Nov 26 15:29:42 2020
Dependencies:

ErrorMessage: installed linux-firmware package post-installation script subprocess returned error exit status 1
HibernationDevice: RESUME=UUID=bdfb5b60-2f66-45e6-a1fc-7c87d5f3867d
InstallationDate: Installed on 2017-08-20 (1194 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
MachineType: System manufacturer System Product Name
PackageArchitecture: all
ProcFB: 0 nouveaudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-56-generic root=UUID=66854b36-6a3e-46f6-930d-2c9ca2f26faf ro
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions: grub-pc N/A
SourcePackage: linux-firmware
Title: package linux-firmware 1.187.6 failed to install/upgrade: installed linux-firmware package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/22/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0906
dmi.board.asset.tag: Default string
dmi.board.name: STRIX Z270E GAMING
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0906:bd03/22/2017:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnSTRIXZ270EGAMING:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer