[git] Permission denied (publickey) when deploying heroku code. fatal: The remote end hung up unexpectedly

If you've already uploaded the key then try to remove the key and then re-upload it with a new key.

 heroku keys:remove //removes the existing key
 ssh-keygen -t rsa //generates a new key in ~/.ssh folder
 heroku keys:add    //uploads the new key, if no arguments r passed then the key generated                              
                    //in default directroy i.e., ~/.ssh/id_rsa is uploaded
 git push heroku

this should work.

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