Install xmountains by entering the following commands in the terminal:
sudo apt update sudo apt install xmountains
Description:
Fractal landscape generator for X
Generates random fractal mountains and displays them in a window (even in the X root window). . While the program is running the fractal is continuously extended on the right and the image is scrolled from right to left to expose the newly generated area.
Homepage: http://www2.epcc.ed.ac.uk/~spb/xmountains/
Version: 2.9-5
Section: universe/games