Ubuntu One syncdaemon was working but was not syncing the files as the balloon message would keep on showing increasing number of files. First I had to install Ubuntu One GTK from software Manager as Xubuntu Raring Ringtail has no GUI interface. starting the GUI Ubuntu One I get this message:
IPC Error Message in substance means inability to contact IPC Server. In actual practice it can be anything which includes inability to find sync data for some reason.
One hard disk broke down. Well almost. It was an old disk and was often suspected to be slow hence I had backed up entire home folder to a different drive about a week back. This old disk had Linux Mint installed on it. On new disk I had Ubuntu Precise Pangolin 12.04 installed with the same /home partition (old backed up from broken drive to new drive). Now as usual we installed cinnamon and removed Unity. Thereafter when I tried to sync with Ubuntu Cloud, it would start but crash with smallest possible message: