lyx file from 2015 not converted to pdf

[Jean-Marc Lasgouttes]

Le 24/03/2020 à 20:23, Wolfgang Engelmann a écrit :

>> What does Help>About>Information on Compilation say? It should tell us 
>> what options where active when configuring LyX.

> LyX Version 2.3.4.2
> (Friday, February 7, 2020)
> 
> Library directory: /usr/share/lyx/
> User directory: ~/.lyx/
> Qt Version (run-time): 5.12.5
> Qt Version (compile-time): 5.12.5

This is the first tab of the dialog. I am interested by the 4th one.

JMarc