sudo nano /etc/netplan/50-cloud-init.yaml

network:
  version: 2
  ethernets:
    ens18:
      dhcp4: false
      dhcp6: false
      addresses: [Adresse IP de guacamole/masque]
      routes:
        - to: 0.0.0.0/0
          via: passerelle
          metric: 100
      nameservers:
        addresses:
          - 8.8.8.8
          - 1.1.1.1