This is the final answer i got from the Eucalyptus Support team for the question
Q: We have successfully installed Eucalyptus on VM, everything is working fine, But our instance in Eucalyptus is not getting to running state. we have tried with managed novlan mode and static mode, Can we get help to solve this problem?
Ans:Hello,

we don't advice to run eucalyptus in a vm and we don't support it directly. You have to work on bare machine to install and successfully run instances of your Eucalyptus cloud. Better Luck. 

regards

graziano