sudo apt install yamllint
cd /etc/netplan
ls -al
# FIND *.YAML FILE and edit it
sudo vi /etc/netplan 00-installer-config.yaml

# This is the network config written by 'subiquity
---
network:
  ethernets:
    enp1s0:
      addresses:
        - 192.168.1.123/24
      gateway4: 192.168.1.131
      nameservers:
        addresses:
          - 192.168.1.140
          - 192.168.1.141
        search:
          - intensewebs.com
  version: 2

sudo netplan apply