Elementary OS does not include a screensaver application, and yes, I agree they are a bit obsolete. They still are fun, though. Here's how to have a screensaver available when you want it, without clogging up your system with the whole xscreensaver paraphenalia. Download the MatrixGL code here: https://sourceforge.net/projects/matrixgl/files/ decompress the file and open a terminal in the folder this creates Now type the following commands sudo apt install mesa-common-dev libgl1-mesa-dev libglu1-mesa-dev ./configure --without-xscreensaver make sudo make install Now to run the screensaver, just assign the following custom command to a hot corner (Applications menu | System settings| Desktop | Hot corners) matrixgl -F Welcome to the matrix ...
