Today I tried to install the broadcom wireless drivers on my Ubuntu 18.04 LTS system.

I downloaded the package and its dependencies here:

Then I installed the package with dpkg and apt-get as described here:

However, I get the following error output which I can't even begin to understand (the .crash file tells me that an if statement has the wrong indentation):

...
Building initial module for 5.3.0-42-generic
ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/bcmwl-kerner-source.0.crash'
Error! Bad return status for module build on kernel: 5.4.0-42-generic
mod probe: FATAL: Module wl not found in directory /lib/modules/5.3.0-42-eneric
...

Please help or tell me it is futile.

EDIT 1:

Output of cat /var/crash/bcmwl-kernel-source.0.crash