Install clamtk-gnome by entering the following commands in the terminal:
sudo apt update sudo apt install clamtk-gnome
GNOME (Nautilus) MenuProvider extension for ClamTk
ClamTk is a graphical front-end for Clam Antivirus. . This package contains a nautilus plugin using nautilus-python to allow right click support for easy virus scanning with ClamTk and thus ClamAV in GNOME.