trouvé sur http://ubuntuforums.org/showthread.php?t=1949530.

STEP 1 - Select These Packages:

desktopcouch-ubuntuone
python-ubuntuone
python-ubuntuone-client
python-ubuntuone-control-panel
python-ubuntuone-storageprotocol
ubuntuone-client
ubuntuone-client-dbg
ubuntuone-control-panel
ubuntuone-control-panel-gtk
ubuntuone-couch

STEP 2 - Ensure These Packages Are NOT Selected:

ubuntuone-client-gnome
ubuntuone-client-gnome-dbg

STEP 3 - Starting Ubuntu One

You will now find Ubuntu One in the Xfce Menu, like so:
Xfce -> Settings -> Ubuntu One
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STEP 4 - Opening the Ubuntu One Folder

You can now open the Ubuntu One folder properly with Thunar