Comment 4 for bug 1302772

Well, I commented out the boot section (All I had to do was comment out the header "boot:" as everything else was already commented).

Ran dpkg --reconfigure -a and ended up choking on "ephemeral:"

Setting up libgo4:amd64 (4.8.2-19ubuntu1) ...
Setting up apt-utils (0.9.15.4ubuntu5) ...
Setting up python-ubuntu-sso-client (13.10-0ubuntu6) ...
Setting up libgomp1:amd64 (4.8.2-19ubuntu1) ...
Setting up maas-cluster-controller (1.5+bzr2204-0ubuntu1) ...
 * Restarting web server apache2 AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
                                                                      [ OK ]
Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/usr/lib/python2.7/dist-packages/provisioningserver/__main__.py", line 43, in <module>
    main()
  File "/usr/lib/python2.7/dist-packages/provisioningserver/utils/__init__.py", line 592, in __call__
    self.execute(argv)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/utils/__init__.py", line 587, in execute
    args.handler.run(args)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/upgrade_cluster.py", line 210, in run
    hook()
  File "/usr/lib/python2.7/dist-packages/provisioningserver/upgrade_cluster.py", line 185, in generate_boot_resources_config
    rewrite_boot_resources_config(config_file)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/upgrade_cluster.py", line 168, in rewrite_boot_resources_config
    tftproot = Config.load_from_cache()['tftp']['root']
  File "/usr/lib/python2.7/dist-packages/provisioningserver/config.py", line 240, in load_from_cache
    cls._cache[filename] = cls.parse(stream)
  File "/usr/lib/python2.7/dist-packages/provisioningserver/config.py", line 183, in parse
    return cls.to_python(yaml.safe_load(stream))
  File "/usr/lib/python2.7/dist-packages/formencode/api.py", line 439, in to_python
    value = tp(value, state)
  File "/usr/lib/python2.7/dist-packages/formencode/schema.py", line 223, in _to_python
    value_dict, state, error_dict=errors)
formencode.api.Invalid: tftp: The input field 'ephemeral' was not expected.