Error capistrano

error

candidosg@candidosg-XPS-L421X:~/midiaexterna$ cap deploy:check
  * 2013-02-06 16:02:29 executing `deploy:check'
  * executing "test -d /home/ubuntu/midiaexterna/releases"
    servers: ["177.71.250.61"]
connection failed for: 177.71.250.61 (Net::SSH::AuthenticationFailed: ubuntu)
candidosg@candidosg-XPS-L421X:~/midiaexterna$ cd
candidosg@candidosg-XPS-L421X:~$ ssh -v -A ubuntu@177.71.250.61
OpenSSH_6.0p1 Debian-3ubuntu1, OpenSSL 1.0.1c 10 May 2012
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 22: Applying options for *
debug1: Connecting to 177.71.250.61 [177.71.250.61] port 22.
debug1: Connection established.
debug1: identity file /home/candidosg/.ssh/id_rsa type 1
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: identity file /home/candidosg/.ssh/id_rsa-cert type -1
debug1: identity file /home/candidosg/.ssh/id_dsa type -1
debug1: identity file /home/candidosg/.ssh/id_dsa-cert type -1
debug1: identity file /home/candidosg/.ssh/id_ecdsa type -1
debug1: identity file /home/candidosg/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1
debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH_5*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.0p1 Debian-3ubuntu1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA d5:e7:2a:5b:d4:03:28:51:e4:cc:03:75:6f:08:42:f3
debug1: Host '177.71.250.61' is known and matches the ECDSA host key.
debug1: Found key in /home/candidosg/.ssh/known_hosts:3
debug1: ssh_ecdsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/candidosg/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug1: Authentication succeeded (publickey).
Authenticated to 177.71.250.61 ([177.71.250.61]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: Requesting authentication agent forwarding.
debug1: Sending environment.
debug1: Sending env LANG = pt_BR.UTF-8
Welcome to Ubuntu 12.04.1 LTS (GNU/Linux 3.2.0-31-virtual x86_64)

 * Documentation:  https://help.ubuntu.com/

  System information as of Wed Feb  6 19:05:32 UTC 2013

  System load:  0.0               Processes:           61
  Usage of /:   13.6% of 7.87GB   Users logged in:     1
  Memory usage: 44%               IP address for eth0: 10.248.46.21
  Swap usage:   0%

  Graph this data and manage this system at https://landscape.canonical.com/

Get cloud support with Ubuntu Advantage Cloud Guest
  http://www.ubuntu.com/business/services/cloud
ubuntu@ip-10-248-46-21:~$