Install unity-lens-applications by entering the following commands in the terminal:
sudo apt update sudo apt install unity-lens-applications
Description:
Application lens for unity
This package contains the "application" lens which can be used inside Unity to launch and install applications.
Homepage: https://launchpad.net/unity-lens-applications
Version: 7.1.0+16.10.20160927-0ubuntu3
Section: universe/gnome