Install libgtkgl2.0-1 by entering the following commands in the terminal:
sudo apt update sudo apt install libgtkgl2.0-1
Description:
OpenGL context support for GTK+ (shared libraries)
The gtkgl library provides GtkGLArea (a GTK+ widget containing an OpenGL context for fast 2D and 3D graphics), GdkGLPixmap (an off-screen rendering context) and GdkGLContext (an OpenGL extension for virtually any drawable widget). . This package contains the shared library.
Homepage: http://www.mono-project.com/GtkGLArea
Version: 2.0.1-2.2
Section: universe/libs