Hello @JPabl.1,
The X-TOUCHGFX-MPU Add-on is based on STM32Cube BareMetal Ecosystem.
There a getting started section in ST Wiki page which would help you to start your first TouchGFX project on STM32MP135F-DK board.
How to install X-TouchGFX MPU Addon - stm32mpu
You might also need to look on official TouchGFX Documentation to get better knowledge about how to develop GUI with TouchGFX framework.
Introduction | TouchGFX Documentation
You can use any of the available examples on the TouchGFX Designer Tool which is compatible with the STM32MP135F-DK board. Please refer to section "5.1. TouchGFX Quick Start" in the ST Wiki page mentioned above for more details.
Unfortunately, as far as I know you can't deploy your pre-built TouchGFX application (BareMetal based app) on your Linux based platform, this won't work on your target. This wouldn't work as the application will be running on the same main processor CA7.
If you have logs about the error, you have got while trying to build your TouchGFX app with STM32CubeIDE please post it here we can try to help you fixing them.
Best Regards,
Akram