Deploy node using MAAS fails

I am trying to do the self-test certification for Ubuntu 14.04.5 on a Kontron server. I have set up MAAS server and have commissioned the SUT. At the "Deploy" step, I get the following errors on the MAAS WebUI:
....
Node changed status - From 'Deploying' to 'Failed deployment' Wed, 12 Jul. 2017 12:01:13
Marking node failed - Installation failed (refer to the installation log for more information). Wed, 12 Jul. 2017 12:01:13
Node installation failure - 'curtin' curtin command install Wed, 12 Jul. 2017 12:01:13
Node installation failure - 'curtin' configuring storage Wed, 12 Jul. 2017 12:01:13
Node installation failure - 'curtin' running 'curtin block-meta custom' Wed, 12 Jul. 2017 12:01:13
Node installation failure - 'curtin' curtin command block-meta Wed, 12 Jul. 2017 12:01:13
Node installation failure - 'curtin' removing previous storage devices Wed, 12 Jul. 2017 12:01:13
PXE Request - installation Wed, 12 Jul. 2017 11:53:55
....

  and the following errors in the maas.log file:
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Jul 12 11:52:28 UServer maas.interface: [info] Allocated automatic IP address 172.253.79.4 for eno1 (physical) on CG2300.
Jul 12 11:52:28 UServer maas.node: [info] CG2300: Status transition from ALLOCATED to DEPLOYING
Jul 12 11:52:28 UServer maas.power: [info] Changing power state (on) of node: CG2300 (gyrqsa)
Jul 12 11:52:32 UServer maas.power: [info] Changed power state (on) of node: CG2300 (gyrqsa)
Jul 12 11:52:47 UServer maas.import-images: [info] Started importing boot images.
Jul 12 11:52:47 UServer maas.import-images: [info] Downloading image descriptions from http://172.253.79.200:5240/MAAS/images-stream/streams/v1/index.json
Jul 12 11:52:47 UServer maas.import-images: [info] Updating boot image iSCSI targets.
Jul 12 11:52:48 UServer maas.import-images: [info] Finished importing boot images, the region does not have any new images.
Jul 12 11:53:55 UServer maas.interface: [info] eth0 (physical) on UServer: New MAC, IP binding observed: a4:bf:01:09:28:6c, 172.253.79.4
Jul 12 12:01:13 UServer maas.node: [info] CG2300: Status transition from DEPLOYING to FAILED_DEPLOYMENT
Jul 12 12:01:13 UServer maas.node: [error] CG2300: Marking node failed: Installation failed (refer to the installation log for more information).
....

Can you please help? I can be contacted at my work email address at <email address hidden>; please CC <email address hidden>.

Thanks in advance,
J.