Troubleshooting Ubuntu Installation
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Known Issues and frequent Questions- "Host key verification failed" Error Message
Some users working on existing servers receive the following error message:
This simply indicates that the key on the server has been changed. One solution is to delete the offending key from your local computer so this error goes away.
You will need your IP address and simply run this command using your IP address.
Then you should be able to log in to the server correctly.