You can click the information icon at the bottom right corner of the dash to view the legal notice, which explains exactly how this works.
Disable Online Content in the Dash
You can disable all online content in the dash from the Privacy control panel. Bear in mind that this also disables other types of online searches, such as the online video feature in the dash.
To launch the Privacy control panel, search for Privacy in the dash and launch the Privacy application.
To uninstall the package, open a Terminal window from the dash.
Type the following command into the Terminal window and press Enter:
Enter your password, type Y to confirm, and Ubuntu will remove the package.
The ads will disappear after you log out and log back in.
