[Qgis-developer] SAGA Processing toolbox geoalgorithm not working on Ubuntu 14.04

[roy]

Dear list,

i'm trying to use SAGA natural neighbour via QGIS toolbox but it's not 
working,
the tool opens the config dialog but when i run it i get
this errors:

Oooops! The following output layers could not be open

  * Grid: /tmp/processing/c62751a9186c4e0694e956b2bf65fda0/USERGRID.tif

The above files could not be opened, which probably indicates that they 
were not correctly produced by the executed algorithm

Checking the log information might help you see why those layers were 
not created as expected

This algorithm requires SAGA to be run. A test to check if SAGA is 
correctly installed and configured in your system has been performed, 
with the following result:

SAGA seems to be correctly installed and configured



and on "OGR" QGIS log:

error 4: Unable to open 
/usr/share/qgis/python/plugins/processing/tests/data/polygons.shp or 
/usr/share/qgis/python/plugins/processing/tests/data/polygons.SHP.

2015-01-21T19:58:47 1 Data source is invalid ()

2015-01-21T20:08:20 1 Data source is invalid ()


are SAGA tools supposed to work or is there some known problem?


P.S. the very same tool works on windows with osgeo4w install

Thanks, Roy.
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