Netplan is the default to configure on Ubuntu.

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

# This file is generated from information provided by
# the datasource.  Changes to it will not persist across an instance.
# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
 
 
network:
    ethernets:
        eth0:
            dhcp4: no
            addresses:
            - 192.168.25.40/24
            - 2001:6b0:1234:1470::40/64
            gateway4: 192.168.25.1
            gateway6: 2001:6b0:1234:1470::1
    version: 2

sudo netplan apply