Copied the example on netplans site and have issues with the interfaces not defined. Below is my config that i'm using. I no longer have internet access on that machine. This was working but rebooted and now it's broken again.
network:
version: 2
renderer: networkd
bonds:
bond0:
dhcp4: yes
interfaces:
- enp0s25
- enp8s0
parameters:
mode: active-backup
primary: enp0s25
Thanks! GD