missing 'Ac6 STM32 Debugging' Debug configuration in Debug perspective
... and this is Debug Configuration panel in System Workbench for STM32 that I've just installed on Linux box.
Here I can Debug with no effrort.
I'll make do having both eclipse and System Workbench for STM32 and target debugging with System Workbench for STM32 only.
Not much of a problem here.
Giangiacomo