Broken Interfaces and wpa_supplicant

Question

I have some how broken the network interface configuration on my pi 3 B running Jessie.

Is there a way to restore all network configurations to default, or a repository where I can copy the original files from?

I am unable to do a fresh install as I have a lot of other configuration already done.

Wireless tab on desktop shows:

No Wireless interfaces found

The problem occurred after attempting this tutorial:

https://howchoo.com/g/ndy1zte2yjn/how-to-set-up-wifi-on-your-raspberry-pi-without-ethernet

Answer 1

How do I set up networking/WiFi/Static IP has instructions to set up, and also contains listings of the default files, for both Jessie and Stretch.

There is no "default" /etc/wpa_supplicant/wpa_supplicant.conf, this is created. There are brief instructions on how to set it up, and links to Foundation tutorials.

No Wireless interfaces found can mean there is an actual hardware problem, or it can be due to dhcpcd being disabled (often due to changes to /etc/network/interfaces).