If you have an android phone, plug it into the macmini via usb, connect to wifi and enable usb tethering.
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Copying this package over USB will not work anyway, even if you get all the dependencies, since firmware-b43-installer is just a script that downloads the firmware (probably because it is illegal for Debian/Ubuntu to redistribute this firmware because of the license).
You need internet. You'll need to use a different network device for this, or use a phone as the other person said.
Or you can copy the firmware files over by hand, from a different Ubuntu/Linux computer. They should be under /usr/lib/firmware/b43.
A quick search tells me that mac mini's have ethernet. Are you able temporarily connect that way to fetch the wifi drivers?
One approach here is the Ubuntu CD/DVD images. You can (could?) use the disk as a package source for apt to install from.
This is incorrect, that firmware is not included in the installer (for legal reasons, probably). firmware-b43-installer is just a script. It downloads some driver from a website and extracts the firmware blobs from that driver using another utility called b43-fwcutter. The package description for that reads:
Description: utility for extracting Broadcom 43xx firmware
This package provides a tool for extracting BCM43xx wireless chip firmware from Broadcom's proprietary driver files.
It is used by the firmware-b43(legacy)-installer packages as part of the automated process of downloading and installing firmware.
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