Install seahorse-nautilus by entering the following commands in the terminal:
sudo apt update sudo apt install seahorse-nautilus
Description:
Nautilus extension for Seahorse integration
Seahorse nautilus is an extension for nautilus which allows encryption and decryption of OpenPGP files using GnuPG - the GNU Privacy Guard program.
Homepage: https://wiki.gnome.org/Apps/Seahorse
Version: 3.11.92-2
Section: universe/gnome