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i've installed last version of libreoffice in ubuntu. 
If i try to convert from docx to pdf /usr/bin/soffice --invisible --convert-to pdf test.doc it works fine, but i got no TOC in result file. Also i try to convert using PHP:

$docx->transformDocument(storage_path('app/temp_docx/test.docx'), storage_path('app/temp_docx/test2.pdf'), 'libreoffice', array('toc' => true));

It also works, but there is no TOC in PDF. What is the reason?
I tried like this, to be sure, that php is using libreoffice method:

$docxConvert = new TransformDocAdvLibreOffice();
$docxConvert->transformDocument(storage_path('app/temp_docx/test.docx'), storage_path('app/temp_docx/test2.pdf'), array('toc' => 'true'));

No TOC there. 
Any suggestions? 
I also tried to convert like this
/usr/bin/soffice --headless --invisible --nodefault --view --nolockcheck --nologo --norestore --nofirststartwizard --convert-to pdf /var/www/application/storage/app/temp_docx/test.docx (same result)

So how can i get TOC in converted file?
And one more question. Is it possible to convert with libreoffice from DOCX to DOCX ( to get TOC before save) ?
I tried to do it in cli, but got error:
root@c3142a888a46:/var/www/html# /usr/bin/soffice --invisible --convert-to docx test.docx
convert /var/www/html/test.docx -> /var/www/html/test.docx using filter : MS Word 2007 XML
Overwriting: /var/www/html/test.docx
Error: Please verify input parameters... (SfxBaseModel::impl_store <file:///var/www/html/test.docx> failed: 0x4c0c(Error Area:Sfx Class:Write Code:12))