Aqui está o procedimento completo para instalar o editor gráfico yED. Abra um terminal ( Ctrl + Alt + T ) e execute:
wget https://www.yworks.com/products/yed/demo/yEd-3.14.4_64-bit_setup.sh
chmod +x yEd-3.14.4_64-bit_setup.sh
sudo -H ./yEd-3.14.4_64-bit_setup.sh