Comment 0 for bug 1821867

After doing a default disco installation on s390x using the beta ISO image aka daily from March 26th and the post-install reboot the system restarts aka reipls (in z/VM in this case) but the interface is not brought up.
Hence no remote connections are possible.

The ip cmd shows:
ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group defaul
t 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: enc600: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default ql
en 1000
    link/ether 02:28:0b:00:00:15 brd ff:ff:ff:ff:ff:ff

The netplan yaml file looks fine:
cat /etc/netplan/*.yaml
# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  renderer: networkd
  ethernets:
    enc600:
      addresses: ¬ 10.245.236.27/24 |
      gateway4: 10.245.236.1
      nameservers:
          search: ¬ canonical.com |
          addresses:
              - "10.245.236.1"

Using ip to bring the interface up doesn't help:
buntu§hwe0007:ß$ sudo ip link set enc600 up
sudo ip link set enc600 up
ubuntu§hwe0007:ß$ ip addr show enc600
ip addr show enc600
2: enc600: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP gr
oup default qlen 1000
    link/ether 02:28:0b:00:00:15 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::28:bff:fe00:15/64 scope link
       valid_lft forever preferred_lft forever
ubuntu§hwe0007:ß$

But finally executing netplan apply does help:
sudo netplan apply --dryrun
sudo netplan apply --dryrun
ubuntu§hwe0007:ß$ sudo netplan apply
sudo netplan apply
ubuntu§hwe0007:ß$ ip addr show enc600
ip addr show enc600
2: enc600: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP gr
oup default qlen 1000
    link/ether 02:28:0b:00:00:15 brd ff:ff:ff:ff:ff:ff
    inet 10.245.236.27/24 brd 10.245.236.255 scope global enc600
       valid_lft forever preferred_lft forever
    inet6 fe80::28:bff:fe00:15/64 scope link
       valid_lft forever preferred_lft forever
ubuntu§hwe0007:ß$

(Sorry for the partly duplicate lines and some strange characters, but this is due to the fact that I copied the output from the console that requires a 3270 terminal emulation)