Install xcompmgr by entering the following commands in the terminal:
sudo apt update sudo apt install xcompmgr
Description:
X composition manager
xcompmgr is the standard composition manager for the X Composite extension, which allows clients to modify what is drawn to the screen before it happens. This composition manager implements shadows, fading, proper translucency, and more.
Version: 1.1.7-1build1
Section: universe/x11