I know this question was already answered but I tried these solution and only had success with additional detail after Creating, Downloading and chmod-ing the keypair file:
using
[user@]hostname] ssh parameter as root@Fi-lab-FloatingIPAddress ,
under root shell or
using sudo command to execute ssh -i kp.pem Fi-lab-FloatingIPAddress
Try to access without root username will results in ssh asks to password even including the keypair associated with that virtual machine.
In other words, the keypair to access fi-lab blueprint or instances only works with root username.
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