IP Address Configuration on Ubuntu

Disable Cloud Init Network Config

By default, Ubuntu replaces network configuration on every reboot. To make your config persistent, create this file:

sudo nano /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg

Add the following content:

network: {config: disabled}

Remove the old config:

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

Create Network Configuration File

Create a new netplan configuration:

sudo nano /etc/netplan/10-netcfg.yaml

Static IP example:

network:
    ethernets:
        enp6s18:
            addresses:
            - 192.168.30.67/24
            nameservers:
                addresses:
                - 192.168.30.250
                search:
                - dmnsn.com
            routes:
            -   to: default
                via: 192.168.30.254
    version: 2

DHCP example:

network:
    ethernets:
        enp6s18:
          dhcp4: true
    version: 2

Set secure permissions on the file:

sudo chmod 600 /etc/netplan/10-netcfg.yaml

Apply the configuration:

sudo netplan apply
ip addr

Note: On a minimal Ubuntu install you may get an error about ovswitch. Fix it with:

sudo apt-get install openvswitch-switch-dpdk
sudo netplan apply