[Bug 2109487] Re: netplan apply - cannot connect to system bus at boot time

[Pengpeng Sun]

Add some findings when I tried to reproduce this issue on vSphere, I
believe dbus was not ready when cloud-init init-local/init services were
still running.

* release-20240710 (netplan ver: 1.0-2ubuntu1.2)
netplan apply finished with Exit Code 0, but logged Failed to connect to system bus: No such file or directory and Falling back to a hard restart of systemd-networkd.service. This means even dbus is not ready, netplan apply could finish correctly.

* release-20250403 (netplan ver: 1.1.1-1~ubuntu24.04.1)
netplan apply stuck.

** Changed in: netplan.io (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/2109487

Title:
  netplan apply - cannot connect to system bus at boot time

Status in cloud-images:
  New
Status in dbus package in Ubuntu:
  New
Status in netplan.io package in Ubuntu:
  Confirmed

Bug description:
  I will reference this comment here from the beginning:

  https://github.com/vmware/open-vm-
  tools/issues/761#issuecomment-2834567855

  I use packer to provision virtual machines starting from ubuntu cloud
  images (ova templates) on vSphere.

  When using cloud image release-20240710 (1.0-2ubuntu1.2), I don't have
  any issues with netplan and everything is provisioned correctly.

  When switching to the latest cloud image version release-20250403
  (netplan 1.1.1-1~ubuntu24.04.1), "netplan apply" doesn't work
  correctly, ending up with the following error:

  "Failed to connect to system bus: No such file or directory and
  Falling back to a hard restart of systemd-networkd.service"

  This could be a regression caused by this backport
  https://bugs.launchpad.net/ubuntu/noble/+source/netplan.io/+bug/2077011,
  but I cannot be sure.

  In my case, the practical consequence is that the open-vm-tools
  scripts don't exit successfully and the network card is not
  automatically connected, as it should. This is somewhat less relevant
  for Canonical/netplan, but this is a scenario that a lot of people
  come across when dealing with provisioning Ubuntu virtual machines in
  vSphere using packer/terraform, so I'm just putting it out there.

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