Install cinnamon-session by entering the following commands in the terminal:
sudo apt update sudo apt install cinnamon-session
Cinnamon Session Manager - Minimal runtime
The Cinnamon Session Manager is in charge of starting the core components of the Cinnamon desktop, and applications that should be launched at login time. It also features a way to save and restore currently running applications. . This package contains the binaries for the Cinnamon Session Manager, but no startup scripts. It is meant for those willing to start cinnamon-session by hand with the components of their choice, and for applications such as MDM that use cinnamon-session internally.