Problems with Netplan's config for Ubuntu Server 18.04.5 for Raspberry Pi

Question

So I want to set up an Raspberry Pi with Ubuntu for a robotic Projekt. Im following this guide.
Like it says I change the /etc/netplan/50-cloud-init.yaml like:
network:
version: 2
renderer: networkd
# Renderer can be 'networkd' or 'NetworkManager'
ethernets:
eth0:
optional: true
dhcp4: false
wifis:
wlan0:
optional: true
dhcp4: true
access-points:
"YOUR-SSID-NAME":
password: "YOUR-PASSWORD"
# uncomment the line below if you're using a Microsoft DHCP Server
#dhcp-identifier: mac

Note: I didn't uncomment the last line, as I'm using a macOS system, but not Sure if that's correct.
The Problem is:
If I type:
sudo netplan --debug try

sudo netplan --debug generate

It gives me the "unkown keywoard "wlan0".
I tried to google the Error, but I'm only finding different kind of errors at the Web. I hope someone can help me.

heynnema · Answer

Your .yaml file lacks proper formatting...
It should look like this... same indentation, spacing, and no tabs:
network:
  version: 2
  renderer: networkd
  ethernets:
    eth0:
      dhcp4: true
      optional: true
  wifis:
    wlan0:
      dhcp4: true
      access-points:
        "YOUR-SSID-NAME":
          password: "YOUR-PASSWORD"

sudo netplan generate
sudo netplan apply
reboot
You must also install wpasupplicant...
sudo apt-get update
sudo apt-get install wpasupplicant
reboot
If your .yaml keeps getting overwritten...
You may also need to create /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
network: {config: disabled}

Problems with Netplan's config for Ubuntu Server 18.04.5 for Raspberry Pi

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