МААС node deployment failed with curtin installer

I have installed Убунту Сервер 15.10 with МААС и have configured two неDES with the МААС Server. The неDES reached to Реади Стате after commissioning. Then I run "juju bootstrap" on shell. One node went to Deploying state with the curtin installer. But after long украл, the deployment failed with the following ошибка on shell:

ОШИБКА failed to bootstrap environment: bootstrap instance started but did not change to Deployed state: instance "/MAAS/api/1.0/nodes/node-9ed9c196-81ee-11e5-bc54-001cc0f8442d /" is started but not deployed

Also, there was following ошибка coming consistently in /var/log/maas/maas.log:

maas.service_monitor: [ОШИБКА] While monitoring service 'tgt' an ошибка was encountered: Unable to parse the включил state from systemd for service 'tgt', включите state reported туз 'failed'.

What could be the reason behind this? Please suggest some solution. Thanks in advance!