Yes, there are graphical user interfaces (GUI) available for blocking IP addresses on Linux Ubuntu. One popular GUI tool is 'gufw' (GUI for Uncomplicated Firewall), which provides a simple and intuitive interface to manage the firewall rules. You can install 'gufw' using the package manager or Ubuntu Software Center. Once installed, you can open 'gufw' and easily add or remove IP addresses from the blocklist. Please note that using a GUI tool might have limitations compared to command-line tools, so it's recommended to familiarize yourself with the command-line methods as well.