After re-watching the video it appears my ad-hoc instructions were a bit unclear. This will be addressed shortly.
The wireless device that comes up when you type the ‘ifconfig’ command is the name of the file you want to make under /etc/network/interfaces.d/
So in your case, if wlan0 is the name of your wireless interface you would create the file named ‘wlan0’, and enter the configurations into the file as seen in the below picture.
Don’t forget to type the below into /etc/dhcpcd.conf:
denyinterfaces wlan0 #or whatever your interface name is
As for the connectivity issue, that does look odd. You for sure were connected to the internet while you were attempting to install isc-dhcp-server? Are you able to download anything else with apt installs, or just isc-dhcp-server? Did you try the sudo apt-get update?
I wonder if the wireless interface you were trying to access the ad-hoc network with didn’t support ad-hoc mode? If you’re curious you can check that on windows by typing “netsh wlan show driver” from the command prompt.
Glad to hear you found an easier workaround though! Perhaps the mobile hotspot should be the course standard for the ‘in the field’ networking, as not all wireless interfaces support ad-hoc mode.
Thanks for sharing that 3/4G chip, I had never seen that before! Imagine flying your 4G drone BLOS from your couch with a laptop- of course I would NEVER do this, FAA I might have to do some tinkering with that!
Totally agree on the lack of clear networking directions- I will be looking to update the ‘in-the-field’ networking method soon!