Install adwaita-icon-theme-full by entering the following commands in the terminal:
sudo apt update sudo apt install adwaita-icon-theme-full
Description:
default icon theme of GNOME
This package contains the default icon theme used by the GNOME desktop. The icons are used in many of the official GNOME applications like eog, Evince, system monitor, and many more.
Version: 3.28.0-1ubuntu1
Section: universe/gnome