To add an "Open Terminal Here" or "Open Shell Prompt Here" right-click menu to a file manager in Linux Gnome, you can use the nautilus-open-terminal package. This package provides a script that allows you to open a terminal or shell prompt in the current directory by right-clicking on a folder or file in the file manager.
To install the nautilus-open-terminal package, you will need to use your system's package manager. For example, on a Debian-based system, you can run the following command:
sudo apt-get install nautilus-open-terminal
Once the package is installed, you should be able to open a terminal or shell prompt in the current directory by right-clicking on a folder or file in the file manager and selecting "Open in Terminal" or "Open in Shell Prompt".
Note: The exact name of the menu option may vary depending on your version of Linux and the file manager you are using.