Glarea is an example application that uses GTK+'s integration with OpenGL.
It is meant to be used as a teaching aid to understand how to use OpenGL inside a GTK+ application.
Enable snaps on Kubuntu and install glarea-example
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.