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Can someone help me please?

I installed texlive-math-extra, and now the compiling error is gone.
The two other problems are yet to be solved though.
Plus, I just noticed that the accents (é,è, etc) are not displayed properly. How to fix that ?

Hello, I'm trying to write pdfs with ubuntu.
So I installed these packages :
texlive-latex-base
texlive-latex-base-doc
texlive-latex-extra
texlive-latex-extra-doc
texlive-latex-recommended
texlive-latex-recommended-doc
and texmaker.

I have a few problems.
First of all texmaker doesn't show as many ...