I have this problem too, spanish locale. I've attached the console command output. Look for the line with the text "Conectar a Ubuntu One". This is where I push the "I already have an account button". It complains about some directory and packages missing. I've updated from Maverick without problems.
** Attachment added: "normal output from ubuntuone-control-panel-gtk" https://bugs.launchpad.net/ubuntu/+source/ubuntuone-control-panel/+bug/773276/+attachment/2099498/+files/ubuntuone-control-panel-gtk.out -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/773276 Title: [Natty] Ubuntuone greyed out forever -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs