STM32MP1 support available in SW4STM32

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world.
And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4; you can download a short video showcasing this on the ac6-tools website (registration required).

System Workbench for STM32

E: Package 'gksu' has no installation candidate

hello I am trying to install sws4stm32 for a project i have run into problems
when i try to run the install using but i get something like gksu required and when i try to install gksu with sudo apt-get install gksu i get error like
E: Package ‘gksu’ has no installation candidate
I dont know what to do
any one had similar issues or knows how to work around this problem
please advice thank you