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[SLUG] ssh key-based auth not working Ubuntu without GUI (X) login??


I've come across an interesting "feature" on the later Ubuntu's - ssh
key-based authentication to a target box doesn't appear to work, unless
I've logged onto the target box through the GUI (X).

Anyone come across this? Anyone know of a fix?

Here's the target box:

% cat /etc/issue.net 
Ubuntu 10.10

Here's me trying to logon to the target box, and I'm not logged on the
GUI on the target box:

% ssh -v cereza
OpenSSH_5.8p1 Debian-1ubuntu3, OpenSSL 0.9.8o 01 Jun 2010
debug1: Reading configuration data /home/sonia/.ssh/config
debug1: Applying options for cereza
debug1: Applying options for *
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to cereza [10.68.206.77] port 22.
debug1: fd 3 clearing O_NONBLOCK
debug1: Connection established.
debug1: identity file /home/sonia/.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/sonia/.ssh/id_rsa-cert type -1
debug1: identity file /home/sonia/.ssh/id_dsa type 2
debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-1024
debug1: Checking blacklist file /etc/ssh/blacklist.DSA-1024
debug1: identity file /home/sonia/.ssh/id_dsa-cert type -1
debug1: identity file /home/sonia/.ssh/id_ecdsa type -1
debug1: identity file /home/sonia/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version
OpenSSH_5.5p1 Debian-4ubuntu5
debug1: match: OpenSSH_5.5p1 Debian-4ubuntu5 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.8p1 Debian-1ubuntu3
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 zlib@xxxxxxxxxxx
debug1: kex: client->server aes128-ctr hmac-md5 zlib@xxxxxxxxxxx
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: RSA
dc:f1:0d:ee:d0:56:b8:64:d5:64:c8:99:ef:00:3d:a7
debug1: Host 'cereza' is known and matches the RSA host key.
debug1: Found key in /home/sonia/.ssh/known_hosts:148
debug1: ssh_rsa_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,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/sonia/.ssh/id_rsa
debug1: Authentications that can continue: publickey,password
debug1: Offering DSA public key: /home/sonia/.ssh/id_dsa
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /home/sonia/.ssh/id_ecdsa
debug1: Next authentication method: password
sonia@cereza's password: 

Then I logon to the GUI of the target box, and hey presto ssh key-auth
works from my source box:

% ssh cereza
Linux cereza 2.6.35-30-generic #56-Ubuntu SMP Mon Jul 11 20:00:22 UTC
2011 i686 GNU/Linux
Ubuntu 10.10

Welcome to Ubuntu!
 * Documentation:  https://help.ubuntu.com/

 New release 'natty' available.
 Run 'do-release-upgrade' to upgrade to it.

 Last login: Tue Aug 23 09:50:38 2011 from zapote.local

--
Sonia Hamilton
http://soniahamilton.wordpress.com
http://www.linkedin.com/in/soniahamilton