I am trying to clone a git repository. I am able to do it successfully from the netbeans IDE but if I try to use the command line to clone the repository with the same ssh private key, I am getting the following error : 
Cloning into 'name'...
Enter passphrase for key '/home/user/.ssh/id\_rsa': 
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

The repository exixts as I am able to clone it from Netbeans.I am using the same private key id\_rsa. I am working on ubuntu 14.04.

Has anyone faced this problem. I am not able to figure out the issue.