Install JabRef 4.2 Ubuntu 18.04

install-JabRef.sh

#!/bin/bash
# Install java packages + javafx
sudo apt-get install default-jdk
sudo apt-get install openjfx

# Download Jabref
sudo wget -P /etc/jabref -O jabref.jar https://www.fosshub.com/JabRef.html/JabRef-4.2.jar

# Create startup script
sudo mkdir /etc/jabref
cat <<EOF > /etc/jabref/jabref.sh
#!/bin/bash                                         
java -jar /etc/jabref/jabref.jar &
EOF

# Create symlink and make startup script executable
sudo chmod +x /etc/jabref/jabref.sh
sudo ln -s /etc/jabref/jabref.sh /usr/local/bin/jabref

# Start Jabref
jabref