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I didn't find the "page style" so I added what you wrote me and now everything goes OK

Thanks Stefan

Hello!

I'll try to explain it:

I've just started writing a new document in Lyx, an article document, and the first thing I would like to do is to write a "header".

So I select "Right header" and then I write what I want. Just after that I press the "eyed-button" to see it as a PDF but the next ...

you are right scottkosty!, my problem has gone away.

I just can say THANK YOU

First of all, thank you StarValkyrie scottkosy for your comments.

I'll try to answer the questions StarValkyrie asked me about:

-The class of doc is "article", but if I change it the problem continues.

- I didn't put any preamble.

-I think it doesn't matter the first few lines because for exmple ...

Hello to my readers; no more than one day ago I installed this wellknown program by a personal recommendation and I find the following problem which hardly leaves me get started:

- I downloaded the latest version I found on the website of Lyx for Ubuntu, everything was installed correctly, and I ...