Comment 2 for bug 498223

I'm sorry to hear Ubuntu One isn't working properly for you. Fortunately, I think there is a workaround for this problem as I believe it's related to bug 455544 which occurs when the bandwidth preferences are set too low (or to the defaults). If you delete ~/.config/ubuntuone/syncdaemon.conf and restart the Ubuntu One client, you should be able to connect. Thank you, Joshua