Comment 82 for bug 1770082

Verification-done on bionic with netplan.io 0.40.1~18.04.2:

Using the following config:

network:
    version: 2
    ethernets:
        maas0:
            addresses:
            - 10.3.21.29/20
            gateway4: 10.3.16.1
            match:
                macaddress: 52:54:00:4d:3e:84
            mtu: 1500
            set-name: maas0

The interface renaming is correctly done at boot time; then changing set-name to 'maas1', bringing down the interface with 'ip link set dev maas0 down', and running 'netplan apply'; the interface is correctly renamed:

ubuntu@nice-baboon:~$ sudo vi /etc/netplan/50-cloud-init.yaml
ubuntu@nice-baboon:~$ sudo netplan apply
ubuntu@nice-baboon:~$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: maas0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:4d:3e:84 brd ff:ff:ff:ff:ff:ff
    inet 10.3.21.29/20 brd 10.3.31.255 scope global maas0
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe4d:3e84/64 scope link
       valid_lft forever preferred_lft forever
ubuntu@nice-baboon:~$
ubuntu@nice-baboon:~$ sudo vi /etc/netplan/50-cloud-init.yaml
ubuntu@nice-baboon:~$ ip link set dev maas0 down
RTNETLINK answers: Operation not permitted
ubuntu@nice-baboon:~$ sudo !!
sudo ip link set dev maas0 down
ubuntu@nice-baboon:~$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: maas0: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
    link/ether 52:54:00:4d:3e:84 brd ff:ff:ff:ff:ff:ff
    inet 10.3.21.29/20 brd 10.3.31.255 scope global maas0
       valid_lft forever preferred_lft forever
ubuntu@nice-baboon:~$ sudo netplan apply
ubuntu@nice-baboon:~$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: maas1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:4d:3e:84 brd ff:ff:ff:ff:ff:ff
    inet 10.3.21.29/20 brd 10.3.31.255 scope global maas1
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe4d:3e84/64 scope link
       valid_lft forever preferred_lft forever