[Qgis-user] Missing "Vector geometry tools - Polygonize" in QGIS geoalgorithms

[Nelson A. de Oliveira]

I am seeing a strange issue here:
I have two Linux machines with QGIS 2.14.1 (installed from Debian). In
one machine I see 107 QGIS geoalgorithms available while at the other
machine I see only 106.

The missing one is "Vector geometry tools → Polygonize".

Both have /usr/share/qgis/python/plugins/processing/algs/qgis/Polygonize.py
as they should, from what I can see.
I don't see any kind of error message while running QGIS.

How can I debug why I cannot see/use it in one machine, please?