[Qgis-user] saga & grass, missing dependency with sextante

[matteo]

Hi guys,
I'm using qgis 1.9 on ubuntu 12.04.
I have some trouble when I try to use the saga and the grass algorithms. 
When I double click one of the function a pop-up windows appear saying:

Missing dependency.This algorithm cannot be run :-(
This algorithm requires GRASS to be run.Unfortunately, it seems that 
GRASS is not installed in your system, or it is not correctly configured 
to be used from QGIS
Click here to know more about how to install and configure GRASS to be 
used with SEXTANTE

But if I launch both grass and saga as standalone I don't have any problem.
Some ideas?

Thanks

Matteo