In order to be able to flash the firmware on Linux, be sure to:
cd ../STM32MPU_workspace/STM32MPU-Tools/STM32CubeProgrammer-x.y.z/Drivers/rules
sudo cp *.* /etc/udev/rules.d/
Serial mode:
Using GTKTerm. Port = /dev/ttyAMC0Â (on Arch). Toggle DTR!