Ubuntu 18.04 Server – Set Static IP With Netplan

sudo vim /etc/netplan/01-netcfg.yaml
network:
    ethernets:
        eno1:
            addresses:
            - 172.20.63.234/24
            - 192.168.10.20/24
            - 192.168.1.240/24
            dhcp4: false
            gateway4: 172.20.63.254
            nameservers:
                addresses:
                - 8.8.8.8
                - 8.8.4.4
                search: []
        enp3s0:
            addresses: []
            dhcp4: true
            optional: true
    version: 2

Testing the Configuration

sudo netplan try

Applying the New Configuration

sudo netplan apply

References
https://blog.programster.org/set-static-ip-with-netplan
https://www.linux.com/learn/intro-to-linux/2018/9/how-use-netplan-network-configuration-tool-linux