Install breathe-icon-theme by entering the following commands in the terminal:
sudo apt update sudo apt install breathe-icon-theme
Description:
A fresh and modern icon theme for Ubuntu
The Breathe icon theme is a refresh of the Human icon theme using KDE's Oxygen icon set as an inspiration but with that distinctly Human feel. . The Breathe Icon Set is created and maintained by the Breathe Icon Team and Ubuntu Artwork community.
Homepage: https://wiki.ubuntu.com/Artwork/BreatheIconSet/
Version: 0.51.2
Section: universe/x11