Fresh 20.10 install, experienced the same issue caused when attempting either manually attempting to install "bcmwl-kernel-source_6.30.223.271+bdcom-0ubuntu6_amd64.deb" or using "Additional Drivers".
sudo apt-get remove --purge bcmwl-kernel-source
Synaptic Package Manager installed: broadcom-sta-source broadcom-sta-dkms broadcom-sta-common
(It also added some dependencies)
Works again!
Fresh 20.10 install, experienced the same issue caused when attempting either manually attempting to install "bcmwl- kernel- source_ 6.30.223. 271+bdcom- 0ubuntu6_ amd64.deb" or using "Additional Drivers".
sudo apt-get remove --purge bcmwl-kernel-source
Synaptic Package Manager installed:
broadcom-sta-source
broadcom-sta-dkms
broadcom-sta-common
(It also added some dependencies)
Works again!