Before everything, make sure your Yun is plugged in.
First, if you think it seems reasonable and you know how, back up your Arduino Yun. Done? Great. Let's keep going.
Next, reset your Arduino Yun by holding the button called "WLAN RST" next to the USB port for 30 seconds. Wait 5 or so minutes.
Then check your WiFi networks. You should see a WiFi network called "Arduino Yún-XXXXXXXXXXXX". Connect to it. It won't have Internet. That's okay.
Open your web browser. Type in "192.168.240.1". You might see a security warning. That's okay too. In a moment, you'll be asked for your password. Use "arduino".
Now, once you're logged in, click on the "Configure" button. Make sure you change the Yún name and password, and the time zone too.
Now, click on the dropdown menu under Wireless Parameters called "Detected Wireless Networks". Change it to the name of a WiFi network you can connect to.
Finally, if your network has a password, enter it. Click "Configure & Restart", and pretty soon, we can start on installing pip!
Once it's restarted, connect to the WiFi network connect to where you told the Yun to connect to (WiFi). Now, open your command prompt.
If you're on Windows, make sure you have the April 2019 update for Windows 10. If you have an older version:
As long as you're using a new version of Linux, Mac OS, Chrome OS, or Windows 10, keep going.
Now, if you don't know how to open your command prompt, here's how:
Once your Yun has finished restarting, type and press Enter/Return the following: "ping [the name of your Arduino Yun should be typed here]"
Find where it says
"Pinging [your arduino yun name].local [important numbers] with 32 bytes of data:"
and write down the numbers and dots where I said "[important numbers]".
Then type in the thing you wrote down into the web address bar of your web browser. Could you connect to it? GREAT!
Relax for a little. You've done a lot. Once you're ready, keep going.
You need to make more space on the Yun. In order to do that, you need a MicroSD card. You're going to remove all data on it, so back it up or make sure it isn't valuable data.
Once you've got your MicroSD card, flip your Yun over. Put into this slot:Next, make sure you have the Arduino IDE. You can download the arduino IDE here if you don't have it yet.
Download time! We've got some files here. Here's the download links:Rev 1 boards
Scroll down to "Start" under "A look to the procedure". Follow all of the instructions in your serial monitor until the tutorial says
"The sketch will continue showing the Yún Linux shell and you will see lots of messages telling you the Yún is starting up.",
because we have a better way.