$ git pull Could not create directory '/home/username/.ssh'. The authenticity of host 'github.com (192.30.252.131)' can't be established. RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48. Are you sure you want to continue connecting (yes/no)? yes Failed to add the host to the list of known hosts (/home/username/.ssh/known_hosts). Permission denied (publickey). fatal: Could no