[Bug 2107225] Re: Disable cloud-init network config in Desktop ISO

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~dbungert/livecd-rootfs/+git/livecd-rootfs/+merge/484436

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https://bugs.launchpad.net/bugs/2107225

Title:
  Disable cloud-init network config in Desktop ISO

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  The Desktop ISO installer enables cloud-init to allow automation with
  Subiquity autoinstall. Currently, cloud-init probes & configures
  networking in the live environment. As described in cloud-init#6110,
  this does not appear to be necessary as NetworkManager should manage
  network connectivity in this context.

  To be clear, I am proposing this as a workaround for cloud-init#6110.

  My understanding of the proposed first steps here are to drop the
  configuration from [2] and instead write netplan configuration in the
  ISOs directly.

  One possible pitfall:

  I did a little bit of additional testing and found that configuring a
  static IP on the kernel command line in combination with disabled
  cloud-init network-config generated DNS issues:

  vmlinuz ip=10.183.135.99::10.183.135.1:255.255.255.0::::10.183.135.1
  network-config=disabled

  The static IP works alright but `resolvectl status` showed no
  configured DNS servers. A `netplan apply` was sufficient to fix it, as
  initramfs-tools converts the cmdline into a netplan configuration.

  [1] https://github.com/canonical/cloud-init/issues/6110
  [2] https://git.launchpad.net/livecd-rootfs/tree/live-build/ubuntu/includes.chroot.minimal.standard.live/etc/cloud/cloud.cfg#n23

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