Please visit the FAQs here: Ubuntu One help - Removing Ubuntu One Client.

Summary:

1. Run the following in a terminal session:

   
   
   

   killall ubuntuone-login ubuntuone-preferences ubuntuone-syncdaemon
   
   sudo rm -rf ~/.local/share/ubuntuone
   
   rm -rf ~/.cache/ubuntuone
   
   rm -rf ~/.config/ubuntuone
   
   mv ~/Ubuntu One/ ~/UbuntuOne_old/
   
   

   
   
   

   If you have UDFs, rename the respective folders. E.g. if you were syncing Documents folders, rename it to Documents_old.




2. Delete Ubuntu One token:

   
   
   
   
   
   • Open the Dash by clicking the Ubuntu Logo in the upper left corner.
   
   
   • Type: Passw
   
   
   • Click Passwords and Encryption Keys.
   
   
   • Go to the Passwords tab, click to expand the Password folder, delete the entry called "Ubuntu One"
   
   



3. In a terminal session run:

sudo apt-get purge ubuntuone-client python-ubuntuone-*