Open a terminal session by clicking on the Ubuntu button in the upper left hand corner, typing in “Terminal” and then clicking the “Terminal” icon
Run these commands in the terminal:
ln -s ~/u1ftp/u1ftp-0.1.zip u1ftp
You sould see “Listening on ftp://127.0.0.1:2121/” output to the terminal. Keep the terminal session open and open your home folder.
Click the File > Connect to Server… menu
Set the fields as follows:
Type: FTP (with login)
Username: Ubuntu One username (email address)
Password: Ubuntu One password
Remember this password: Checked
Click “Connect” and you should see a window pop up shortly with your folders and files on Ubuntu One. You can now copy files to and from here. If you want to bookmark this for future use, right-click on the entry in the left hand pane (“FTP as…”) and select “Add Bookmark”.