Do you think Ubuntu spies on you?
Answer: Yes it does I will show you how it does. I found out this said by Richard Stallman.
Free Software Foundation President Richard Stallman called Ubuntu Linux "spyware" because the operating system sends data to Ubuntu maker Canonical when a user searches the desktop.

SPYWARE
Google defines Spyware as a software that enables a user to obtain information about another's computer activities by transmitting data covertly from their hard drive.
How to do safe search?
In order to do safe browsing on your dashboard you need to filter result. Doing this you can let your interested machine to search for you. Just unclick the sources which you don't want to get you information.
Debian has provided an easy method to browse your machine offline. In order to do so as shown in the picture below Off the on button and you are totally ofline. None of your searched data will be used by the online sources.