SSH Warning: “Remote host identification has changed”: Error & Solution explained

[ Thanks to GeekRide for this link. ]

"A. The possible reasons for getting this error are:

* You have re-installed you system and trying to ssh to the newly installed system.
* You have assigned the IP address of one system to another system and trying to ssh.
* You system is dual boot with different ssh keys in both flavors of linux.
* You are using an IP for load balancing and trying to ssh to the same IP.
* You generated new ssh keys for your system. (Read this article for the re-generation of the host keys: Generate SSH host keys)
* Someone trying to do some nasty things"

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