It shouldn’t be that hard. PureOS is Debian based. Debian should have those drivers and you should be able to install those drivers in PureOS. I’d be willing to help you if you can give me more information. As well as show you how to fix similar driver issues, in a terminal type:
sudo lshw
sudo = superuser do
ls = list
hw = hardware
Find your WiFi card and let me know what it is.