Install libgranite4 by entering the following commands in the terminal:
sudo apt update sudo apt install libgranite4
Description:
extension of GTK+ libraries
Granite is an extension of GTK+. Among other things, it provides complex widgets and convenience functions designed for use in apps built for elementary OS. . This package contains the shared library.
Homepage: https://github.com/elementary/granite
Version: 0.5+ds-1
Section: universe/libs