Install gnome-icon-theme-gartoon-redux by entering the following commands in the terminal:
sudo apt update sudo apt install gnome-icon-theme-gartoon-redux
Description:
Cartoon-style SVG icon theme based on Gartoon
Gartoon Redux is an expanded version of the Gartoon theme, with dozens of new icons. PNG renderings of the SVG icons are also provided.
Homepage: http://www.gnome-look.org/content/show.php/Gartoon+Redux?content=74841
Version: 1.10-0ubuntu3
Section: universe/gnome