> It seems to be a systemd problem/feature that startup gets delayed if
a network connection exists but is not responding.

This would most likely be a bug in the definition of other units on the
system, rather than systemd itself. In normal circumstances, if systemd-
networkd-wait-online.service times out (which is the symptom I assume
you are pointing to here) that does not *necessarily* block startup,
because services that are related to e.g. starting the graphical
environment should have no ordering dependency on network-online.target
(or systemd-networkd-wait-online.service itself).

But, something on this system might be configured that way nonetheless.

You can try looking at:

$ systemctl list-dependencies --reverse network-online.target
$ systemctl list-dependencies network-online.target
$ systemctl list-dependencies --reverse systemd-networkd-wait-online.service

to see if anything sticks out. Please share that output.

Or, you can see if it helps to simply:

$ systemctl disable systemd-networkd-wait-online.service

** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2120216

Title:
  System boot very slow. Login screen delayed by network problems.

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