If the following error message appears : capistrano github Permission denied (publickey)
:
- make sure you've followed github process to generate, register and save your server deploy key
- check https://help.github.com/articles/error-permission-denied-publickey/
- follow https://help.github.com/articles/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent/
- add your SSH key to the ssh-agent