Install libcscreensaver0 by entering the following commands in the terminal:
sudo apt update sudo apt install libcscreensaver0
Description:
library and introspection data used by cinnamon-screensaver
cinnamon-screensaver is a screen saver and locker that aims to have simple, sane and secure defaults, and be well integrated with the Cinnamon desktop. . This package contains the library used by the screensaver.
Homepage: http://cinnamon.linuxmint.com/
Version: 3.6.1-2
Section: universe/libs