This isn't reproducible in yakkety, but it does reproduce locally in a
QEMU xenial instance (although a lot harder than on the infra, which is
why I didn't see it at first). It seems systemd 229's systemd-networkd-
wait-online has a bug that it does not actually wait for the interfaces
to be fully configured. When it exits, the status is

‚óŹ 412: eth42
       Link File: /lib/systemd/network/99-default.link
    Network File: /run/systemd/network/10-netplan-eth42.network
            Type: ether
           State: degraded (configured)
          Driver: veth
      HW Address: 0a:9b:04:93:f9:c0
             MTU: 1500
         Address: fe80::89b:4ff:fe93:f9c0
             DNS: 2600:0000:0000:0000:0000:0000:0000:0001

i. e. the interface is still being set up. I would not like to work
around that in the tests, because if we are actually going to use
networkd on xenial the integration with network-online.target must work.

** Changed in: systemd (Ubuntu Xenial)
       Status: Fix Committed => In Progress

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https://bugs.launchpad.net/bugs/1627641

Title:
  Backport netplan to xenial

Status in network-manager package in Ubuntu:
  Fix Released
Status in nplan package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in network-manager source package in Xenial:
  Fix Committed
Status in nplan source package in Xenial:
  Fix Committed
Status in systemd source package in Xenial:
  In Progress

Bug description:
  For snappy (at first at least) we need to provide netplan in xenial,
  as for the first snappy GA release we must not use any PPAs any more.

  netplan's NetworkManager backend depends on two patches to read
  configuration and connections from /run/NetworkManager/. These will
  need to be backported for full netplan support; but they are not
  required for snappy as this will use a snapped NM. However, this will
  need a temporary hack
  (https://code.launchpad.net/%7Emorphis/netplan/+git/netplan/+merge/306607)
  until snaps can actually properly support OS components like
  NetworkManager.

  PATCHES:
  
https://git.launchpad.net/~network-manager/network-manager/+git/ubuntu/commit/?h=xenial&id=6dcdb85
  
https://anonscm.debian.org/cgit/pkg-systemd/systemd.git/commit/?h=ubuntu-xenial&id=4e9c52b0bb

  REGRESSION POTENTIAL:
  netplan: The risk for existing installations is practically zero as nplan 
does not exist in xenial yet and thus will not be pulled in during upgrades.
  NetworkManager: Nothing in xenial expects/uses /run/NetworkManager/ and as 
it's an ephemeral tmpfs there is no risk of existing files there. If the 
patches are broken it could in theory happen that NetworkManager also does not 
properly read files from /etc/NetworkManager/ any more, so the -proposed 
package must verify that existing connections still work.
  systemd: This does change behavior of networkd on restart, but the previous 
behaviour was arguably buggy. networkd is not being used by default or 
advertised in Ubuntu 16.04, so this will not affect the vast majority of 
installations.

  TEST PLAN:
  1. Run "NetworkManager --print-config" and save the output.
  2. Install the proposed NetworkManager and confirm that existing connections 
(from /etc/NetworkManager/system-connections) still work.
  3. Run "NetworkManager --print-config" again and verify that the output is 
the same as in step 1.
  4. netplan has a very comprehensive integration test suite run as 
autopkgtest, which covers NetworkManager (including the /run patches) and 
network. Confirm that it succeeds.

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