You appear to be running an X server； please exit X before installing. For further details, please

This error message is typically encountered when trying to install certain software packages on a Linux distribution while running an X server. The X server is a software component responsible for managing graphical user interfaces in Linux.

To resolve this issue, you will need to exit the X server before attempting to install the software package. To do so, you can try switching to a different virtual console by pressing Ctrl+Alt+F1 (or F2, F3, etc.) and logging in as the root user or a user with administrative privileges. From there, you can stop the X server by running the following command:

sudo systemctl stop display-manager

This command will stop the display manager, which is responsible for starting the X server. Once the display manager is stopped, you should be able to install the software package without encountering the error message.

After the installation is complete, you can restart the display manager by running the following command:

sudo systemctl start display-manager

This will start the display manager and the X server, allowing you to log back in to your graphical desktop environment.