Install gfceu by entering the following commands in the terminal:
sudo apt update sudo apt install gfceu
Description:
Graphical front-end using GTK2 for the FCE Ultra NES emulator
GNOME FCE Ultra (gfceu) is a graphical front-end for the FCE Ultra Nintendo Entertainment System intended for the GNOME desktop. Gfceu eases the gaming experience for the user and provides a clean, simple, and intuitive interface. Features: * Input configuration * Sound configuration * Video configuration * Network play
Homepage: http://dietschnitzel.com/gfceu/
Version: 0.6.1-0ubuntu4
Section: universe/games