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At it says Ubuntu Single Sign On. What are it's uses? How is it useful?

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up vote 5 down vote accepted is a service used by various ubuntu websites that allow you to use a single account for login instead of creating a separate account for each.

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It's not only useful for websites but for any cloud service. It's you Ubuntu One login and you can even set up your own machine to log in using it. – Javier Rivera Aug 3 '10 at 8:41
It is true that does use OpenID, but as far as i know there are no pam modules allowing OpenID logins. – Ressu Aug 3 '10 at 13:13

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