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ssh to a compute instance

I have started an instance on a nova compute node . The instance is active . The instance is: 32 bit ubuntu-10.04-server-cloudimg-i386 - a standard instance that cited by (stackrc) devstack

I can ping it ( but do not know a default user /password to log in to it .

trying to ssh with any name returns the following :

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that a host key has just been changed. The fingerprint for the RSA key sent by the remote host is 89:71:83:85:6e:92:a0:3a:8a:4b:35:9f:1d:a6:d1:17. Please contact your system administrator. Add correct host key in /home/dubi/.ssh/known_hosts to get rid of this message. Offending RSA key in /home/dubi/.ssh/known_hosts:4 remove with: ssh-keygen -f "/home/dubi/.ssh/known_hosts" -R RSA host key for has changed and you have requested strict checking. Host key verification failed.

Any advice ?