Install gnome-session-common by entering the following commands in the terminal:
sudo apt update sudo apt install gnome-session-common
Description:
GNOME Session Manager - common files
The GNOME Session Manager is in charge of starting the core components of the GNOME 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 translations, data files and startup scripts which are common to the GNOME and GNOME fallback sessions.
Version: 3.28.1-0ubuntu2
Section: gnome