I am getting "File Sync error. (auth failed (AUTH_FAILED))".
It brought in my other devices that are registered, registers this computer also....but it doesn't sync
this is what I did http://pastebin.com/REkZrmDM
closed as too localized by Bruno Pereira Mar 17 '12 at 21:54
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Try setting your clock and timezone correctly and then reconnecting. It worked for me.
I think this is because Ubuntu One synchronizes your files based on the time it was last modified.