Replace wlan0 with eth0

Steps

1. Inspect eth0 and wlan0: ifconfig. See wlan0 is RUNNING and eth0 is not.
2. Edit /etc/netplan/*.yml to have the following:

   network:
       version: 2
       ethernets:
         renderer: networkd
         eth0:
           dhcp4: true
                   

3. Apply: sudo netplan apply
4. Inspect eth0 and wlan0: ifconfig. See eth0 is RUNNING and wlan0 is not.