How generate SSH key for github on ubuntu

 Generate the ssh key on any path, after that type just Enter leaving void all asks.

A file will be created in the path " /{your_user}" called ".ssh"

Into the same folder type:

ls -ant

Like this.

Register RSA on github.

You have to enter to github section "Personal Setting --> "Setting" --> "SSH and GPG"

Enter to .ssh folder called ".ssh"

cd  /{your_user}.ssh

into the same folder type:

more id_rsa.pub

You should appear a key, copy and paste in github into previus menu mentioned.