lyx file from 2015 not converted to pdf

[Jean-Marc Lasgouttes]

Le 24/03/2020 à 19:41, Wolfgang Engelmann a écrit :
> 
> 
> Am 24.03.20 um 19:29 schrieb Pavel Sanda:
>> On Tue, Mar 24, 2020 at 07:21:27PM +0100, Wolfgang Engelmann wrote:
>>> LyX: Software exception Detected
>>> LyX has caught an exception, it will now attempt to save all unsaved
>>> documents and exit.
>>> Exception: std::exception
>>>
>>> Did I understand you correctly, that you did not receive this message?
>>
>> No, but you might have assertions enabled.
> 
> what does assertion mean?
> 
>> Did you self compile or do you use distribution binary?
> 
> no, I used the Debian actualizations

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

JMarc