It is very easy now to install Ubuntu Server on Raspberry Pi. THE following URL has detailed instructions.
https://ubuntu.com/tutorials/how-to-install-ubuntu-on-your-raspberry-pi#1-overview
In step 3, you will have issue if you use Windows 10 machine instead of Linux machine. You cannot read the file system to edit "network-config" file. To resolve the issue - boot your Raspberry Pi, log in using default user ID and password (ubuntu/ubuntu). Change the default password after changing the the config.
Edit the following file using 'nano'.
sudo nano /etc/netplan/50-cloud-init.yaml
Add WiFi details in the yaml file, save and restart. Make sure to remove '()'.network:
ethernets:
eth0:
dhcp4: true
optional: true
version: 2
wifis:
wlan0:
dhcp4: true
optional: true
access-points:
(name of the home SSID):
password: (WPA2 password)
You are ready for step 4.
