** Description changed:

  [Impact]
  Minimal installs using netplan to configure the network.
  
  [Test case]
  1) Install Ubuntu minimal server / cloud image
  2) Edit /etc/netplan/01-netcfg.yaml to configure the network as necessary.
  3) Run 'sudo netplan apply'. Verify that the network comes up correctly.
  4) Reboot.
  5) Verify that the network comes up properly.
  
  [Regression potential]
- Minimal; this reverts changes in a package that was never released to 
-updates, only available as SRU in -proposed and on the devel release. This 
only applies to the order in which systemd-networkd is enabled when used as a 
renderer for netplan configuration, to start in multi-user.target instead of 
the "correct", but inefficient "network-online.target" as the latter may not be 
depended upon in minimal installs.
+ Minimal; this reverts changes in a package that was never released to 
-updates, only available as SRU in -proposed and on the devel release. This 
only changes the systemd config to ensure systemd-networkd.service is included 
as an active service whenever multi-user.target is wanted (which is the 
default) instead of only when network-online.target is wanted, since the latter 
is optional and on some installations is not required at all.  This does not 
change the ordering of boot at all since in both cases systemd-networkd.service 
is correctly Before=network.target, and it is Before/After, not Wants/Requires, 
that determines ordering.
  
  ---
  
  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)

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https://bugs.launchpad.net/bugs/1821867

Title:
  network interface is down after post-install reboot of a default disco
  installation

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