I fixed the problem by killing the syncdaemon, deleting ~/.config/ubuntuone/syncdaemon.conf* and restarting the daemon. Running the Preferences app then rewrites a valid .conf file.
I fixed the problem by killing the syncdaemon, deleting ~/.config/ ubuntuone/ syncdaemon. conf* and restarting the daemon. Running the Preferences app then rewrites a valid .conf file.