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I have encountered the following error in nova compute logs when launching a new instance with OpenStack Icehouse:

"AgentError: Error during following call to agent: 
['ovs-vsctl', '--timeout=120', 'del-port', 'br-int', u'qvoe75657b1-b5']\n"]

The selected image is Ubuntu Server Trusty Tahr. How can I fix this?

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The selected flavor disk was too small as indicated by this bug report

After selecting a flavor of type m1.small, everything went smoothly

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