How to uninstall Ubuntu One?
Solution 1:
Ubuntu One is spread over many packages. You can remove them by running the following command in a terminal:
sudo apt-get purge ubuntuone* python-ubuntuone-storage*
Solution 2:
I removed it through the Software Center and haven't had any problems since. I'm not sure if its completely removed, but it doesn't show up anywhere I see on my computer (not even the messaging menu). The Ubuntu One folder in my Documents was still there though so I had to remove that.
Solution 3:
To completely remove Ubuntu One, just close U1 services and type this on your console (ctrl + alt + t)
sudo rm -rf ~/.share/local/ubuntuone
rm -rf ~/.cache/ubuntuone
rm -rf ~/.config/ubuntuone
mv ~/Ubuntu\ One/ ~/Ubuntu\ One_old/
Open Applications->Accessories->Passwords and Encryption Keys, go to the Passwords tab, delete the Ubuntu One token
sudo apt-get purge ubuntuone*
This will remove Ubuntu One and all of its settings, and move your files to a folder called Ubuntu One_old in your home directory!