I have tried to add my PC to my Ubuntu One account 3 or 4 times: while I log in successfully in the Ubuntu One interface (after deleting my Ubuntu One password in 'passwords'), my folders don't give me an option to synchronise.
I don't get the pink bar saying 'these folders cannot be synchronised'; I get nothing at all, no option. The second time I tried it seemed to work – but then it stopped working again.
u1sdtool --status? – DoR Dec 11 '10 at 17:54