Comment 0 for bug 1618522

On my current pi3 I have with the ubuntu-core snap (rev 354) I get the following netplan configuration file:

ubuntu@localhost:~$ cat /etc/netplan/00-initial-config.yaml
network:
 version: 2
 ethernets:
   all:
    match:
     name: "*"
    dhcp4: true

This generates the following .networkd file

ubuntu@localhost:~$ cat /run/systemd/network/10-netplan-all.network
[Match]
Name=*

[Network]
DHCP=ipv4

If I look now at the output of networkctl I see it also tries to manage my mlan0 device which is a WiFi one and should be managed according to the netplan rule:

ubuntu@localhost:~$ networkctl
IDX LINK TYPE OPERATIONAL SETUP
  1 lo loopback carrier configured
  5 eth1 ether no-carrier configuring
  6 eth0 ether routable configured
  7 mlan0 wlan no-carrier configuring

In summary, the networkd generator inside netplan currently does not limit the generated .network file to tell networkd to only look at ethernet devices but rather tell it to control every device available on the system.