Comment 28 for bug 1282759

Following the instructions in the following page solved my "auhentication" problem in Ubuntu One.

https://one.ubuntu.com/help/faq/what..._failed-state/

Basically, start seahorse and delete all Ubuntu One related stored passwords (perhaps not all is needed, but I deleted all). Reconnect. You will be asked for usename/password.

Hopefully, this helps for some others who still are having problems.

It would have been good to know what caused the problem, because I have not had made any changes when the problem had occurred.

Cheers.
tuuk