package linux-firmware 1.187.4 failed to install/upgrade: installed linux-firmware package post-installation script subprocess returned error exit status 1

[Jim Sizelove]

I am attempting to upgrade from xenial through bionic to focal. The upgrade to bionic went fine, but this error prevented the upgrade to focal.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: linux-firmware 1.187.4
ProcVersionSignature: Ubuntu 4.15.0-124.127-generic 4.15.18
Uname: Linux 4.15.0-124-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Nov 17 08:19 seq
 crw-rw---- 1 root audio 116, 33 Nov 17 08:19 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu27.12
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CasperMD5CheckResult: skip
Date: Tue Nov 17 08:18:46 2020
Dependencies:

Ec2AMI: ami-0257d667d23f263ad
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-east-1d
Ec2InstanceType: m3.large
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
ErrorMessage: installed linux-firmware package post-installation script subprocess returned error exit status 1
IwConfig:
 eth0 no wireless extensions.

 lo no wireless extensions.
Lsusb: Error: command ['lsusb'] failed with exit code 1:
Lsusb-t:

Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1:
MachineType: Xen HVM domU
PackageArchitecture: all
PciMultimedia:

ProcFB: 0 cirrusdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-124-generic root=UUID=d4f2aafc-946a-4514-930d-4c45e676f198 ro console=tty1 console=ttyS0
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
RelatedPackageVersions: grub-pc 2.04-1ubuntu26.6
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: initramfs-tools
Title: package linux-firmware 1.187.4 failed to install/upgrade: installed linux-firmware package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to focal on 2020-11-17 (0 days ago)
dmi.bios.date: 08/24/2006
dmi.bios.vendor: Xen
dmi.bios.version: 4.2.amazon
dmi.chassis.type: 1
dmi.chassis.vendor: Xen
dmi.modalias: dmi:bvnXen:bvr4.2.amazon:bd08/24/2006:svnXen:pnHVMdomU:pvr4.2.amazon:cvnXen:ct1:cvr:
dmi.product.name: HVM domU
dmi.product.version: 4.2.amazon
dmi.sys.vendor: Xen