On Mon, Jul 29, 2019 at 12:07:13PM +0200, HAROLDO GAMBINI SANTOS wrote:
> Any suggestions ?

Sounds like your system is not aware of symbols in the file cmsy10.ttf
(and probably other font files normally installed with lyx into 
/usr/share/lyx/fonts/). 

If you have standard lyx install I would report this problem to
to arch package maintainer.

HTH,
Pavel

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