Install elementary-icon-theme by entering the following commands in the terminal:
sudo apt update sudo apt install elementary-icon-theme
Description:
simple and appealing Tango-styled icon theme
The official elementary icons are designed to be simple and appealing. . These icons are the inspiration behind Ubuntu's default Humanity icon theme.
Homepage: http://www.elementary-project.com/
Version: 2.7.1-0ubuntu7
Section: universe/gnome