Install gnome-icon-theme by entering the following commands in the terminal:
sudo apt update sudo apt install gnome-icon-theme
Description:
GNOME Desktop icon theme
This package contains the default icon theme used by the GNOME desktop. The icons are used in the panel menu, and in nautilus and other applications, to represent the different applications, files, directories, and devices.
Version: 3.12.0-3
Section: universe/gnome