Yes, please remove the new kernels via apt.

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https://bugs.launchpad.net/bugs/1902421

Title:
  iwl3945: Low throughput on focal / Linux 5.4

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hello out their, I seem to be having some issues related WiFi on my
  Xubuntu 20.04 install.

  My main issue is that my WiFi connection on my Xubuntu install versus
  my Windows 7 Starter install is a lot slower. Currently the highest
  speed I have gotten on Xubuntu has been 10mbps, I was getting around
  30-50mbps on Windows. I tried editing the default-wifi-powersave-
  on.conf and setting it to 2 because that seemed to be a commonly
  recommended answer, but doesn't seem to be helping. I have also tried
  using "Additional Drivers" to try and see if their was another driver
  available to no avail.

  A user on the Xubuntu IRC chat (tomreyn) suggested a few things and we
  collected this info about my wireless chipset, I hope it helps:

  https://paste.ubuntu.com/p/DbhNsN9JsD/

  Thanks for any help in this matter!

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-52-generic 5.4.0-52.57
  ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
  Uname: Linux 5.4.0-52-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.10
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mitch       980 F.... pulseaudio
  CasperMD5CheckResult: skip
  CurrentDesktop: XFCE
  Date: Sun Nov  1 04:46:44 2020
  InstallationDate: Installed on 2020-09-25 (36 days ago)
  InstallationMedia: Xubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 
(20200731)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  Lsusb-t:
   /:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
   /:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
   /:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
   /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
   /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/8p, 480M
  MachineType: Gateway MT6821
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-52-generic 
root=UUID=e9fce119-f720-47f8-a508-c4cb1b9e8bde ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-52-generic N/A
   linux-backports-modules-5.4.0-52-generic  N/A
   linux-firmware                            1.187.3
  RfKill:
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/27/2006
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: 77.09
  dmi.board.vendor: Gateway
  dmi.board.version: 77.09
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 8
  dmi.chassis.vendor: Gateway
  dmi.chassis.version: Rev.1
  dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvr77.09:bd11/27/2006:svnGateway:pnMT6821:pvr3408141R:rvnGateway:rn:rvr77.09:cvnGateway:ct8:cvrRev.1:
  dmi.product.name: MT6821
  dmi.product.version: 3408141R
  dmi.sys.vendor: Gateway

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