Modifying the netplan to add interfaces and VLANs

Below is an example of the default netplan file to add an aditional unnumberd interface.

root@docker-app-1:~# cat /etc/netplan/00-installer-config.yaml
# This is the network config written by 'subiquity'
network:
  ethernets:
    ens160:
      addresses:
      - 10.128.50.10/24
      nameservers:
        addresses:
        - 1.1.1.1
        - 1.0.0.1
        search: []
      routes:
      - to: default
        via: 10.128.50.1
    ens192: {}
  version: 2

Below is an example of the default netplan file to add an aditional unnumberd interface with an attached unnumbered VLAN.

network:
  ethernets:
    ens160:
      addresses:
      - 10.128.50.10/24
      nameservers:
        addresses:
        - 1.1.1.1
        - 1.0.0.1
        search: []
      routes:
      - to: default
        via: 10.128.50.1
    ens192: {}
  version: 2

  vlans:
      vlan40:
          id: 40
          link: ens192