Same problem here after an upgrade to maverick for a machine that has been working fine with u1 in the past.
As indicated in https://wiki.ubuntu.com/UbuntuOne/Bugs, I did reset my previous key from gnome-keyring, tried connecting and got this error. Let me know if I can provide more info or where I can search for more details from my side. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/696361 Title: Ubuntu sso fails with 'An HTTP non-2xx response code was received' -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs