Comment 38 for bug 1846535

the issue Richard describes also applies to GCP and Azure instances.

The netplan configuration is not re-generated if the mac address changes and is hardcoded with a `match: { mac: address}`. So if a image is created the newly spawned instances do not have network enabled on their main interface.

the only work around i've found is

```
# disabling default cloudInit network and enable dhcp based on known interfaces
echo "network: {config: disabled}" > /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
echo 'network:
    version: 2
    renderer: networkd
    ethernets:
        ens5:
            dhcp4: true
            dhcp6: true
            optional: true
        ens4:
            dhcp4: true
            dhcp6: true
            optional: true
' > /etc/netplan/50-cloud-init.yaml
```