MAAS 1.7如何部署乌托邦图像

安装MAAS 1.7并成功部署了几个Trusty映像; 但是，无法部署任何乌托邦图像。 按照http://maas.ubuntu.com/docs/bootsources.html添加了utopic存储库，现在我的启动源如下所示：

$ maas maas17 boot-sources read $CLUSTER_UUID [ { "url": "http://maas.ubuntu.com/images/ephemeral-v2/daily/", "keyring_data": "", "resource_uri": "/MAAS/api/1.0/boot-sources/1/", "keyring_filename": "/usr/share/keyrings/ubuntu-cloudimage-keyring.gpg", "id": 1 } ] 

在部署期间，选择了utopic映像，我得到以下内容：

 ... Gave up waiting for root device. Common problems: - Boot args (cat /proc/cmdline) - Check rootdelay= (did the system wait long enough?) - Check root= (did the system wait for the right device?) - Missing modules (cat /proc/modules; ls /dev) ALERT! /dev/disk/by-path/ip-10.0.0.17:3260-iscsi-iqn.2004-05.com.ubuntu:maas:ephemeral-ubuntu-amd64-generic-utopic-daily-lun-1 does not exist. Dropping to a shell! BusyBox v1.22.1 (Ubuntu 1:1.22.0-8ubuntu1) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) [ 99.600706] random: nonblocking pool is intialized 

有关如何部署乌托邦图像的任何想法？
干杯，

编辑1：似乎是一个已知问题https://bugs.launchpad.net/maas/+bug/1391354编辑2：目前，解决方法是不使用“使用快速安装程序”选项进行部署。