Situation

Change forticlient EMS server IP.

Solution

[1]
Log in Ubuntu Server 

[2]
(不一定會是99，但是數字大的優先。)
sudo vi /etc/netplan/50-cloud-init.yaml

[3]
network:
    version: 2
    renderer: networkd
    ethernets:
        ens160:
            dhcp4: false
            addresses:
                - 192.168.1.10/24
            routes:
                - to: default
                    via: 192.168.1.254
            nameservers:
                addresses: [8.8.8.8 168.95.1.1]

[4]
sudo netplan apply

[5]
sudo reboot

Practical Testing

[1]
ip a

[2]
hostname -I