Ubuntu One捆绑安装在Ubuntu上，但是从来不用它。Google了一下完整的卸载方法。
出处：https://answers.launchpad.net/ubuntuone-client/+faq/778
步骤：
sudo rm -rf ~/.local/share/ubuntuone
rm -rf ~/.cache/ubuntuone
rm -rf ~/.config/ubuntuone
rm -rf ~/Ubuntu\ One/
sudo apt-get purge ubuntuone-client* python-ubuntuone-storage*
sudo rm -rf /usr/share/applications/ubuntuone-installer.desktop
Open Applications->Accessories->Passwords and Encryption Keys, go to the Passwords tab, delete the Ubuntu One token