Delta moins schrieb:

I'm a new user of LyX. I tried to look the website documentation and the help 
Lyx files but I didn't manage to understand how to use a package like titlesec 
in Lyx. I'm using Ubuntu so I first check that this package was installed on my 
system and it is. In fact I have a metapackage called texlive-latex-extra that 
includes the titlesec package. When I look in Lyx in the modules (french word) 
section in the document parameters, I have a list of modules that I can use in 
Lyx but not titlesec...

Add this command to your document preamble (Document->Settings->LaTeX preamble):
\usepackage{titlesec}

Maybe titlesec needs to be loaded with some options. This is explained in the documentation of the titlesec package:
http://www.ctan.org/tex-archive/help/Catalogue/entries/titles.html

regards Uwe

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