[Bug 2036358] Re: systemd wait-online now times out after jammy and lunar upgrade

[BloodyIron]

I'm now seeing a workable version of systemd available (but kept back?)
on my 22.04 LTS systems without having to enasble proposed on them. This
version (249.11-0ubuntu3.11) addresses the long boot problem, but I've
had to tell apt directly to install systemd to trigger the update. For
anyone who needs this right now, IMO go ahead and install it as I have
not seen any side-effects. But for those who don't yet have the problem,
updating will probably eventually apply the update to your system
(assuming you update regularly of course).

Thanks devs!

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https://bugs.launchpad.net/bugs/2036358

Title:
  systemd wait-online now times out after jammy and lunar upgrade

Status in systemd package in Ubuntu:
  Invalid
Status in systemd source package in Jammy:
  Fix Released
Status in systemd source package in Lunar:
  Fix Released

Bug description:
  [NOTE]

  If you are running a desktop system and you see this issue, you should
  run:

  $ systemctl disable --now systemd-networkd.service

  This will disable systemd-networkd and associated units, including
  systemd-networkd-wait-online.service. NetworkManager and systemd-
  networkd should not be running at the same time. On desktop,
  NetworkManager is the default network stack.

  [Impact]

  When all interfaces are "not required for online", e.g. when they are
  marked "optional: true" in netplan, systemd-networkd-wait-online will
  timeout. Or, in other words, systemd-networkd-wait-online will timeout
  even though all interfaces are ignored, hence none of them will ever
  be marked as "ready." Depending on what units depend on network-
  online.target, this can delay boot by 120 seconds (the default timeout
  for systemd-networkd-wait-online).

  [Test Plan]

  1. Create a new LXD container. These instructions assume jammy is the
  release, but the same can be done for lunar.

  $ lxc launch ubuntu-daily:jammy jammy
  $ lxc exec jammy bash

  2. Once in the container, modify the default /etc/netplan/10-lxc.yaml
  so that eth0 is configured with "optional: true":

  $ vi /etc/netplan/50-cloud-init.yaml # Use whatever editor you like
  $ cat /etc/netplan/50-cloud-init.yaml
  network:
    version: 2
    ethernets:
      eth0:
        dhcp4: true
        dhcp-identifier: mac
        optional: true

  3. Re-generate and apply the netplan configuration.

  $ netplan generate
  $ netplan apply

  4. Manually run systemd-networkd-wait-online, and observe that all
  links are ignored, and the command times out:

  $ SYSTEMD_LOG_LEVEL=debug /lib/systemd/systemd-networkd-wait-online --timeout=10
  Found link lo(1)
  Found link eth0(19)
  lo: link is ignored
  eth0: link is ignored
  Timeout occurred while waiting for network connectivity.

  [Where problems could occur]

  This patch partially re-instates a patch remove in bug 1982218.
  However, instead of exiting if all links are unmanaged, we exit if all
  links are ignored in manager_configured(). If the patch was wrong, we
  may re-introduce bug 1982218, so as part of this SRU verification,
  that bug should be tested too. Any other regressions would also be
  related to systemd-networkd-wait-online behavior.

  [Original Description]

  On Ubuntu 22.04 desktop system using network-manager and upgrading to
  systemd 249.11-0ubuntu3.10, wait-online now times out which prevents
  logins (GDM, ssh, console) until it does time out. This seems to be
  introduced by the change for
  https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1982218.

  https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1982218/comments/21
  also mentioned the problem on Lunar.

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