I have installed GRASS GIS following this install manual.
I have installed SAGA GIS following this install manual.
and finally I have installed QGIS 2.18.1 following the official details for install in Ubuntu Debian/Ubuntu.
The problem is I can't use algorithms from GRASS, SAGA and TAUDEM in the QGIS interface.
I have toolbox processing plugin and I have configure the options providers for all software (SAGA, GRASS) and not working.
Only GDAL tools are working in the plugins and QGIS algorithms. Standalone out of QGIS, SAGA and GRASS GIS work fine.
How to configure QGIS to work like work in Windows?
System details QGIS 2.18.1 Ubuntu 16.04.
TOOLBOX OPTIONS SETTINGS:
Finally I think so this is solution for my another question Why can't I use processing algorithms in a standalone PyQGIS script?