Is there any SSO Wordpress plugin?

Yes. You will need a patched version of the regular OpenID plugin plus the Launchpad/SSO plugin:

lp:~canonical-isd-hackers/wordpress-openid-integration/trunk
lp:~canonical-isd-hackers/wordpress-launchpad-integration/trunk

We also have a Launchpad teams plugin which can be used with Ubuntu SSO:

lp:~canonical-isd-hackers/wordpress-teams-integration/trunk

Setup should be fairly simple - see the README files and let us know if you have any problems.

Thanks Stuart Metcalfe, that solved my question.

But it do not sent me back to WordPress after the Ubuntu SSO login screen... it just sent me to a blank screen!!

This sounds like an error which is being suppressed. Can you change your PHP settings to display errors (or output them to a log file) and tell us what errors are being produced, please?

Curl FAIL is it a fault with my web provider or SSO plugin?

[INFO] PHP version: 5.2.14
[INFO] PHP memory limit: 128M
[INFO] Include Path:
/hsphere/local/home/voidcode/go-ubuntu.dk/wiki/wp-admin
/hsphere/shared/apache/libexec/php5ext/php
[INFO] WordPress version: 3.0.4
[INFO] MySQL version: 5.0.67
[INFO] WordPress' table prefix: wp_
[FAIL] Curl: Hardened php (suhosin) extension active -- curl version checking skipped.
[OK] Big Integer support: GMP is installed.
[INFO] Plugin Revision: 518
[INFO] Plugin Database Revision: 24426
[INFO] XRDS-Simple: XRDS-Simple plugin is installed.
[OK] Overall Plugin Status

Please check if the curl extension is installed on your server. I believe it's required in order to do https OpenID logins (which Ubuntu SSO does).

phpinfo says.
cURL support: enabled
cURL Information: libcurl/7.15.3 OpenSSL/0.9.8b zlib/1.2.3

But i do not has https on my server(no dedikeret ip)
Is https required on my server?

https isn't required on your server - only curl OpenSSL support to talk to the SSO server (which you have so that shouldn't be the problem). We know these plugins work as we deploy them to a number of company blogs. This may indicate a problem with your environment somewhere. Can you work through the openid plugin (starting at the point where you return from the openid server) adding debugging/logging statements to each step until you identify the exact location of the error?

Cool it seems to work if I set launchpad server to "ubuntu SSO production" mode.
So it was just an error 40 ;) many thanks Stuart for your help!!

Glad it worked :) Out of interest, which option was it that didn't work?

Production, Testing, staging and Ubuntu SSO staging.