How to install nibbler chess GUI

The simplest method is to set nibbler file to be executable and then run it by ./nibbler.

If you want to install it to the system with desktop icon - use below commands

cd ~/Downloads
wget -c https://github.com/rooklift/nibbler/releases/download/v2.2.1/nibbler-2.2.1-linux.zip
sudo unzip nibbler-2.2.1-linux.zip -d /opt/
sudo chmod +x /opt/nibbler-2.2.1-linux/nibbler
sudo mkdir -p /usr/local/share/applications

cat <<EOF | sudo tee /usr/local/share/applications/nibbler.desktop
[Desktop Entry]
Type=Application
Version=1.0
Name=Nibbler
Icon=/opt/nibbler-2.2.1-linux/resources/app/pieces/K.png
Exec=/opt/nibbler-2.2.1-linux/nibbler
Terminal=false
StartupNotify=false
Categories=Game;BoardGame;
EOF

As the result you will find Nibbler in the desktop environment menu.

To call Nibbler from terminal you have to execute below command to create a symlink for it:

sudo ln -s /opt/nibbler-2.2.1-linux/nibbler /usr/local/bin/nibbler

and then call it using nibbler command.

You are free to report issue to Nibbler developer about possible installer, snap/flatpak/appimage/whatever package, icon and so on.