GNU/Linux Ubuntu 21.10 Installing MacBook Air Wi-fi Driver without Internet Guide
Hi! The linked Post shows you How to Install MacBook Air Wireless Wifi/Bluetooth Driver Offline in Ubuntu 21.10 Impish GNU/Linux.
Most noteworthy: to achieve this Setup you simply need any Online Computer with a Browser and a USB Stick to Copy the downloaded Packages.
But if you dispose of an Android Mobile Phone with Internet Acces, then an Easier Solution should be of using it! See: Internet Connection USB Tethering Guide.
And MacBook Airs are by default equipped of the Broadcom Wi-fi Cards.
So the linked Guide describe Step-by-step How to Install Broadcom Wireless Driver on Ubuntu Impish.
Ubuntu 21.10 MacBook Air Wireless Driver Installation