How to Install and Autostart XScreenSaver on Ubuntu 18.04, Ubuntu 19.04

XScreensaver is a screen saver and locker for the X11 display server. Ubuntu ships with the gnome-screensaver, but it never worked out of the box. This tutorial shows you how to install XScreenSaver on Ubuntu 18.04/Ubuntu 19.04 and how to autostart it at boot time.

Install XScreenSaver on Ubuntu 18.04, Ubuntu 19.04

XScreensaver is included in Ubuntu software repository, so you can easily install it by running the following command in a terminal window.

sudo apt install xscreensaver

Read full tutorial here: https://www.linuxbabe.com/ubuntu/install-autostart-xscreensaver-ubuntu-18-04-19-04