Comment 16 for bug 1635560

David, the logs you collected were from a boot where maas just told the node to power down.
possibly after a fail already occurred.

The 2 things taht stick out in the log are the posting events failing, and what cloud-init is complaining about invalid config.

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/cloudinit/stages.py", line 792, in _run_modules
    freq=freq)
  File "/usr/lib/python3/dist-packages/cloudinit/cloud.py", line 70, in run
    return self._runners.run(name, functor, args, freq, clear_on_fail)
  File "/usr/lib/python3/dist-packages/cloudinit/helpers.py", line 199, in run
    results = functor(*args)
  File "/usr/lib/python3/dist-packages/cloudinit/config/cc_apt_configure.py", line 284, in handle
    ocfg = convert_to_v3_apt_format(ocfg)
  File "/usr/lib/python3/dist-packages/cloudinit/config/cc_apt_configure.py", line 748, in convert_to_v3_apt_format
    cfg = convert_v2_to_v3_apt_format(cfg)
  File "/usr/lib/python3/dist-packages/cloudinit/config/cc_apt_configure.py", line 714, in convert_v2_to_v3_apt_format
    oldkey))
ValueError: Old and New apt format defined with unequal values True vs False @ apt_preserve_sources_list