Fix @ (at) character problem with Ubuntu in Macbook

If you can't write the @ character in Ubuntu, you should do this:

1. System > Preferences > Keyboard
2. Go to Keyboard Distribution label
3. Click Options
4. Look for something like "Key to access the third level" (sorry, my Ubuntu is Spanish ;-)
5. Select the key you are used to use when typing the @ symbol (I selected the "Alt" key)

That's all,
Enjoy!!

Some keywords for spanish readers: arreglar, problema, arroba, macbook, ubuntu