Public bug reported:

Device ID:
Network controller [0280]: Broadcom Inc. and subsidiaries BCM4306 802.11b/g 
Wireless LAN Controller [14e4:4320] (rev 03)

WiFi worked correctly in Ubuntu MATE 20.04. Now I'm getting very slow
throughput and constant error messages like the following:

b43-pci-bridge 0000:03:02.0: swiotlb buffer is full (sz: 2390 bytes),
total 0 (slots), used 0 (slots)

It sounds like this may be related to errors introduced in b43-fwcutter
1:019-5 with installing the wrong firmware, as reported in Debian bugs
#958566 and #960279.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: firmware-b43-installer 1:019-6
ProcVersionSignature: Ubuntu 5.8.0-22.23-generic 5.8.14
Uname: Linux 5.8.0-22-generic x86_64
ApportVersion: 2.20.11-0ubuntu49
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: MATE
Date: Wed Oct 14 14:52:18 2020
InstallationDate: Installed on 2019-12-08 (311 days ago)
InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Release amd64 (20191017)
PackageArchitecture: all
RebootRequiredPkgs:
 bcmwl-kernel-source
 bcmwl-kernel-source
SourcePackage: b43-fwcutter
UpgradeStatus: Upgraded to groovy on 2020-10-12 (2 days ago)

** Affects: b43-fwcutter (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug groovy

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https://bugs.launchpad.net/bugs/1899848

Title:
  Broken WiFi Install on Ubuntu (MATE) 20.10 for BCM4306 (rev 03)

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