Cloning instance - Original kernel not available when creating AMI

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http://serverfault.com – I have a EC2 Ubuntu server on Amazon cloud and I'm trying to clone an instance "X" by creating a snapshot of the instance and creating an AMI from that snapshot. The problem is: When creating the AMI, the Kernel used in the instance "X" is not available and if I choose another one, the server isn't booting correctly. Steps that I've done -Kernel ID of instance "X" is aki-825ea7eb -The default kernel was choose at installation time for instance "X" -Created a snapshot of the instace "X" root volume -Create AMI from that snapshot ( try to choose the kernel aki-825ea7eb, but it's not available. (HowTos)