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I'm not that familiar with openstack running under Ubuntu, most of mine were on RedHat/CentOS and Scientific Linux. I've got similar problems before, here were what I check and find out the problems. Since you mentioned you can't ping the instance, wonder whether the instance was really boot up. If you change to the instances_path directory and into the target instance subdirectory, the console.log for that instance should tell you it's status. If you have consoleauth.log you should be able to find out how you define the vnc host and the port for the VM.