generate thumbnail not working for file system crawling

Fess 11.2.1
Debian 9
Java™ SE Runtime Environment (build 1.8.0_131-b11)


with Debian 9/8/Ubuntu, generate thumbnail always returns 0 results with file system crawling.
Instead working with web crawling.

unoconv xpdf imagemagick fonts-vlgothic libreoffice-common phantomjs

The commandline
are working.

Also tried enabling Crawler Job but same results.

How can I debug this problem?

Thank you

Could you check if the following command works?

/usr/share/fess/bin/generate-thumbnail msoffice <MS Office file> <Output Path> 

yes, it generate a low-res multipage pdf.
Tried with .doc, .ppt and .pdf.

This is not an OS issue, because the same happens with Centos or Doker images (latest tag).

With Centos I installed this:

bzip2 fontconfig freetype freetype-devel fontconfig-devel libstdc++ unoconv libreoffice-headless vlgothic-fonts ImageMagick

I’ll check and fix it in next release…