Yet more information:
I've now uninstalled the various dkms packages that following the procedures in 
the webpages (referred to previously) and the repos (in Software & Updates app) 
for them. These packages are: r8125-dkms, r8168-dkms & realtek-8125-dkms. The 
repos are for https://launchpad.net/~hardkernel/+archive/ubuntu/ppa and 
https://github.com/awesometic/realtek-r8125-dkms. Should I uninstall the dkms 
package?

I've also reset the keys for Secure Boot in the BIOS.

Rebooting after doing the above still results in WiFi hanging and no
Wired fuctionality shown for establishing a network connection by
clicking on the top right of the screen.

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/2022826

Title:
  Ethernet hangs

Status in linux-firmware package in Ubuntu:
  New

Bug description:
  I'm now getting my wired (i.e. Ethernet) connection hanging on trying
  to connect. I've tried switching ports (on the router) and using a
  different cable, but still the same.

  ifconfig shows for Ethernet:
  enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
  ether 50:eb:f6:ef:a4:e6 txqueuelen 1000 (Ethernet)
  RX packets 2779 bytes 250524 (250.5 KB)
  RX errors 0 dropped 1 overruns 0 frame 0
  TX packets 355 bytes 72171 (72.1 KB)
  TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

  sudo lshw -C enp2s0 shows nothing

  lspci -nn shows for Ethernet: 02:00.0 Ethernet controller [0200]:
  Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller [10ec:8125]
  (rev 05)

  I found a web page: https://tutorialforlinux.com/2021/05...based-systems/
  I followed the instructions and installed realtek-r8125-dkms package OK. On 
rebooting, I followed the instructed procedure (shown when installing the 
package) of creating a password and then entering it when requested on the 
reboot. But still same problem. Any ideas what to do?
  PS I've switched Wi-Fi on (though I'd prefer to use Ethernet, as my Wi-Fi is 
a little flaky due to walls) in order to post this question.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: linux-firmware 20220329.git681281e4-0ubuntu3.13
  ProcVersionSignature: Ubuntu 5.19.0-43.44~22.04.1-generic 5.19.17
  Uname: Linux 5.19.0-43-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82.5
  Architecture: amd64
  CRDA: N/A
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Jun  3 07:29:15 2023
  Dependencies: firmware-sof-signed 2.0-1ubuntu4.1
  InstallationDate: Installed on 2022-08-21 (285 days ago)
  InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
  MachineType: ASUSTeK COMPUTER INC. MINIPC PN50-E1
  PackageArchitecture: all
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.19.0-43-generic 
root=UUID=1d99d177-09b2-43e7-b6c1-451d081353f8 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.19.0-43-generic N/A
   linux-backports-modules-5.19.0-43-generic  N/A
   linux-firmware                             20220329.git681281e4-0ubuntu3.13
  SourcePackage: linux-firmware
  UpgradeStatus: Upgraded to jammy on 2022-10-06 (239 days ago)
  dmi.bios.date: 03/18/2021
  dmi.bios.release: 4.5
  dmi.bios.vendor: ASUSTeK COMPUTER INC.
  dmi.bios.version: 0405
  dmi.board.asset.tag: Default string
  dmi.board.name: PN50-E1
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 35
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnASUSTeKCOMPUTERINC.:bvr0405:bd03/18/2021:br4.5:svnASUSTeKCOMPUTERINC.:pnMINIPCPN50-E1:pvr0405:rvnASUSTeKCOMPUTERINC.:rnPN50-E1:rvrTobefilledbyO.E.M.:cvnDefaultstring:ct35:cvrDefaultstring:sku:
  dmi.product.family: Vivo PC
  dmi.product.name: MINIPC PN50-E1
  dmi.product.version: 0405
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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