Ubuntu 18.04.3

I decided to create both IPv4 and IPv6 addresses.  I disabled dhcp.    Fortinet doesn’t do DHCPv6 reservations.  I can’t match IPv4 to IPv6.

A Boolean represents a true/false value. Booleans are formatted as English words (“true”/“false”, “yes”/“no” or “on”/“off”) for readability and may be abbreviated as a single character “y”/“n” or “Y”/“N”.

They moved the network configuration to here: etc/netplan$ sudo vi 01-netcfg.yaml

version: 2
renderer: networkd
dhcp4: false
dhcp6: false
addresses: [, ‘fd00:192:168:1::65/64’]
gateway4 :
gateway6 : fd00:192:168:1::173
addresses: [,]

Sudo netplan try: tests it
Sudo netplan apply : enables it.