SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   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 get more information from the ac6-tools website and download two short videos (registration required) highlighting:

System Workbench for STM32

E: Package 'gksu' has no installation candidate

I have the same installation problems with Linux Mint 19.3 Tricia base: Ubuntu 18.04 bionic.

As mentioned in the previous post, gksu has been removed from Debian, Ubuntu 18.04 and other newer Linux distribution versions. From all accounts gvfs admin should achieve similar functionality by adding admin:// prefix to the path when using terminal. So far no success as the installer still requires gksu.