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I am having this exact same issue - fresh Ubuntu 18.04 installation on a physical box, conjure-up openstack-lxd, the deployment goes fine, I can get into the dashboard and do everything except spawn an instance, and when I jump into the Nova container and check the logs I see "RescheduledException: Build of instance x-y-z was re-scheduled: Image could not be found." and then "Exceeded maximum number of retries."

Did you find a solution dklinkman?

Does anyone know what is going on and how to fix it?

Here's the full log from nova-conductor.log from when I tried to create the image (and I did try with a couple different images, including one I successfully uploaded via the dashboard) -

2018-11-09 19:38:33.230 15164 ERROR nova.scheduler.utils [req-af236df1-2973-4cce-b35a-31b2cc03f61e ef04640543a74fce9ac9e465c9f1e688 33d8b8ecbc85499bb9196fe0e1459e9a - 56a7064922b342918db6696c21739d81 56a7064922b342918db6696c21739d81] [instance: a9ada324-0717-41a3-9cca-bd868b7f904f] Error from last host: juju-4d09cd-14 (node juju-4d09cd-14): [u'Traceback (most recent call last):\n', u'  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1840, in _do_build_and_run_instance\n    filter_properties, request_spec)\n', u'  File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2120, in _build_and_run_instance\n    instance_uuid=instance.uuid, reason=six.text_type(e))\n', u'RescheduledException: Build of instance a9ada324-0717-41a3-9cca-bd868b7f904f was re-scheduled: Image  could not be found.\n']
2018-11-09 19:38:33.232 15164 WARNING nova.scheduler.utils [req-af236df1-2973-4cce-b35a-31b2cc03f61e ef04640543a74fce9ac9e465c9f1e688 33d8b8ecbc85499bb9196fe0e1459e9a - 56a7064922b342918db6696c21739d81 56a7064922b342918db6696c21739d81] Failed to compute_task_build_instances: Exceeded maximum number of retries. Exhausted all hosts available for retrying build failures for instance a9ada324-0717-41a3-9cca-bd868b7f904f.: MaxRetriesExceeded: Exceeded maximum number of retries. Exhausted all hosts available for retrying build failures for instance a9ada324-0717-41a3-9cca-bd868b7f904f.
2018-11-09 19:38:33.232 15164 WARNING nova.scheduler.utils [req-af236df1-2973-4cce-b35a-31b2cc03f61e ef04640543a74fce9ac9e465c9f1e688 33d8b8ecbc85499bb9196fe0e1459e9a - 56a7064922b342918db6696c21739d81 56a7064922b342918db6696c21739d81] [instance: a9ada324-0717-41a3-9cca-bd868b7f904f] Setting instance to ERROR state.: MaxRetriesExceeded: Exceeded maximum number of retries. Exhausted all hosts available for retrying build failures for instance a9ada324-0717-41a3-9cca-bd868b7f904f.
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [req-7d21b40c-2304-41e3-a706-3aa7c75e4d09 - - - - -] [instance: a9ada324-0717-41a3-9cca-bd868b7f904f] Failed to deallocate networks: NoSuchOptError: no such option keystone_authtoken in group [DEFAULT]
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f] Traceback (most recent call last):
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]   File "/usr/lib/python2.7/dist-packages/nova/conductor/manager.py", line 366, in _cleanup_allocated_networks
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]     context, instance, requested_networks=requested_networks)
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]   File "/usr/lib/python2.7/dist-packages/nova/network/neutronv2/api.py", line 1270, in deallocate_for_instance
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]     self._unbind_ports(context, ports_to_skip, neutron)
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]   File "/usr/lib/python2.7/dist-packages/nova/network/neutronv2/api.py", line 527, in _unbind_ports
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]     port_client = get_client(context, admin=True)
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]   File "/usr/lib/python2.7/dist-packages/nova/network/neutronv2/api.py", line 153, in get_client
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]     _ADMIN_AUTH = _load_auth_plugin(CONF)
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]   File "/usr/lib/python2.7/dist-packages/nova/network/neutronv2/api.py", line 70, in _load_auth_plugin
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]     nova.conf.neutron.NEUTRON_GROUP)
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]   File "/usr/lib/python2.7/dist-packages/keystoneauth1/loading/conf.py", line 122, in load_from_conf_options
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]     name = conf[group].auth_type
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]   File "/usr/lib/python2.7/dist-packages/oslo_config/cfg.py", line 2523, in __getitem__
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]     return self.__getattr__(key)
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]   File "/usr/lib/python2.7/dist-packages/oslo_config/cfg.py", line 2519, in __getattr__
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]     raise NoSuchOptError(name)
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f] NoSuchOptError: no such option keystone_authtoken in group [DEFAULT]
2018-11-09 19:38:33.380 15164 ERROR nova.conductor.manager [instance: a9ada324-0717-41a3-9cca-bd868b7f904f]

Thanks!