WiFi connection is slow and occasionally drops

[John Haddad]

WiFi connection has high latency and slow speeds and is occasionally dropped. Connecting to a TP-Link Archer A20 V1. Windows driver is stable.

apt-cache policy bcmwl-kernel-source
bcmwl-kernel-source:
  Installed: 6.30.223.271+bdcom-0ubuntu5
  Candidate: 6.30.223.271+bdcom-0ubuntu5
  Version table:
 *** 6.30.223.271+bdcom-0ubuntu5 500
        500 http://us.archive.ubuntu.com/ubuntu focal/restricted amd64 Packages
        100 /var/lib/dpkg/status

sudo lspci -vvnn | grep -A 9 Network
pcilib: sysfs_read_vpd: read failed: Input/output error
06:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4360 802.11ac Wireless Network Adapter [14e4:43a0] (rev 03)
 Subsystem: ASUSTeK Computer Inc. BCM4360 802.11ac Wireless Network Adapter [1043:85df]
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0, Cache Line Size: 32 bytes
 Interrupt: pin A routed to IRQ 18
 Region 0: Memory at f7e00000 (64-bit, non-prefetchable) [size=32K]
 Region 2: Memory at f7c00000 (64-bit, non-prefetchable) [size=2M]
 Capabilities: [48] Power Management version 3
  Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
  Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=2 PME-

lsb_release -rd
Description: Ubuntu 20.04.1 LTS
Release: 20.04

uname -a
Linux <my_hostname> 5.4.0-42-generic #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

sudo dmidecode -s bios-version
2501

sudo dmidecode -s bios-release-date
07/21/2014

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: bcmwl-kernel-source 6.30.223.271+bdcom-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Aug 25 09:00:47 2020
InstallationDate: Installed on 2020-07-31 (25 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: bcmwl
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.