SSH authentification with public key fails

I have my id_rsa.pub key under my /home/user/.ssh. I carefully copied that key and paste my key to respository Git account.

While trying to connect from my local system to my git respository, I got the following error:

warning: Authentication failed.
Disconnected; no more authentication methods available (No further 
authentication methods available.)

I removed SSH in system and re-enable and did again, but no luck. I have no idea what's happening with my SSH key. Can any one please tell me on this?

Note : I noticed in my home /home/user/.ssh && /home/user/.ssh2

Solution 1:

read more about the whole public key thing 'here'. openssh wants the public-key in a file named ~/.ssh/authorized_keys. is that where you put it?