Public bug reported:

brightness is also not adjusting

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-42-generic 5.4.0-42.46
ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.10
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  gdm        1017 F.... pulseaudio
                      ishaanvijayverma   1533 F.... pulseaudio
 /dev/snd/controlC1:  gdm        1017 F.... pulseaudio
                      ishaanvijayverma   1533 F.... pulseaudio
CRDA:
 global
 country IN: DFS-UNSET
        (2402 - 2482 @ 40), (N/A, 20), (N/A)
        (5150 - 5350 @ 160), (N/A, 23), (N/A)
        (5725 - 5875 @ 80), (N/A, 23), (N/A)
CasperMD5CheckResult: skip
Date: Fri Oct 30 10:09:45 2020
ErrorMessage: installed linux-image-5.4.0-42-generic package post-removal 
script subprocess returned error exit status 1
InstallationDate: Installed on 2020-10-27 (2 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: HP HP Pavilion Gaming Laptop 15-ec0xxx
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-52-generic 
root=UUID=2d39bae2-1422-481e-9b78-5401aee1b46c ro quiet splash nomodeset 
vt.handoff=7
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 2.04-1ubuntu26.6
SourcePackage: linux-signed
Title: package linux-image-5.4.0-42-generic 5.4.0-42.46 failed to 
install/upgrade: run-parts: /etc/kernel/postrm.d/zz-update-grub exited with 
return code 2
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/06/2019
dmi.bios.vendor: AMI
dmi.bios.version: F.05
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 86D5
dmi.board.vendor: HP
dmi.board.version: 96.31
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAMI:bvrF.05:bd11/06/2019:svnHP:pnHPPavilionGamingLaptop15-ec0xxx:pvr:rvnHP:rn86D5:rvr96.31:cvnHP:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV HP Pavilion
dmi.product.name: HP Pavilion Gaming Laptop 15-ec0xxx
dmi.product.sku: 167W1PA#ACJ
dmi.sys.vendor: HP

** Affects: linux-signed (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-package focal

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https://bugs.launchpad.net/bugs/1902197

Title:
  package linux-image-5.4.0-42-generic 5.4.0-42.46 failed to
  install/upgrade: run-parts: /etc/kernel/postrm.d/zz-update-grub exited
  with return code 2

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