Github user wido commented on the issue:
https://github.com/apache/cloudstack/pull/1572
@ustcweizhou Using 'vm.rng.enable=true' you can enable or disable the RNG.
This controls if the XML is generated or not.
This is set to false by default, so it will work on Ubuntu 12.04 without
any problems as long as you don't enable it.
Ubuntu 12.04 is however still way to old and is using a ancient Java
version. So Ubuntu 12.04 will become unsupported anyway in the near future.
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