package bcmwl-kernel-source 6.20.155.1+bdcom-0ubuntu0.0.1 failed to install/upgrade: installed bcmwl-kernel-source package post-installation script subprocess returned error exit status 10

How are you trying to install? Did you download the bcmwl-kernel-source from a website? That version for bcmwl seems to be from 9 years ago

Yes sir I am trying to install and yes it is old. I should have known it
wouldn't work. But what I'm trying to do is get a WiFi dongle working on
Focal Fossa I've tried two dongles and both supposedly they are
compatible with Window$, Mac and Linux. But 20.04 doesn't see them no
matter how many times I reboot.

On 11/2/21 6:23 AM, Jeremy wrote:
> How are you trying to install? Did you download the bcmwl-kernel-source
> from a website? That version for bcmwl seems to be from 9 years ago
>

You should be able to install the driver from the driver manager or by using this command in terminal with an ethernet connection

sudo apt update && sudo apt install bcmwl-kernel-source

I did try that and rebooted still 'no WiFi adapters found'. And when I
go into additional drivers 'no drivers available'. I am running a Dell
Optiplex 9020 using a WiFi dongle that reportedly works with Window$,
Mac and Linux.

On 11/3/21 5:14 AM, Jeremy wrote:
> You should be able to install the driver from the driver manager or by
> using this command in terminal with an ethernet connection
>
> sudo apt update && sudo apt install bcmwl-kernel-source
>

See https://askubuntu.com/a/1163018/300665

Thank you Jeremy.

I was skeptical at first but then ran the steps listed and lo and behold
I've got WiFi.

On 11/4/21 5:19 AM, Jeremy wrote:
> See https://askubuntu.com/a/1163018/300665
>