Linux - Font Black in DrawString

1

Hi to all,
I’m porting a project from monogame windows to linux,
when i use Drawstring on linux the font appear black and some square char.

Is there a solution ?

I use on begin this:
//base.ScreenManager.SpriteBatch.Begin(SpriteSortMode.Deferred, null, null, null, null, null, scaleMatrix);
base.ScreenManager.SpriteBatch.Begin(SpriteSortMode.Deferred, BlendState.AlphaBlend, SamplerState.PointClamp, DepthStencilState.None, RasterizerState.CullCounterClockwise, null, scaleMatrix);

This is the spritefont definition

<?xml version="1.0" encoding="utf-8"?> 
<!--
Modify this string to change the font that will be imported.
-->
<FontName>Georgia</FontName>

<!--
Size is a float value, measured in points. Modify this value to change
the size of the font.
-->
<Size>8</Size>

<!--
Spacing is a float value, measured in pixels. Modify this value to change
the amount of spacing in between characters.
-->
<Spacing>0</Spacing>

<!--
UseKerning controls the layout of the font. If this value is true, kerning information
will be used when placing characters.
-->
<UseKerning>true</UseKerning>

<!--
Style controls the style of the font. Valid entries are "Regular", "Bold", "Italic",
and "Bold, Italic", and are case sensitive.
-->
<Style>Regular</Style>

<!--
If you uncomment this line, the default character will be substituted if you draw
or measure text that contains characters which were not included in the font.
-->
<!-- <DefaultCharacter>*</DefaultCharacter> -->

<!--
CharacterRegions control what letters are available in the font. Every
character from Start to End will be built and made available for drawing. The
default range is from 32, (ASCII space), to 126, ('~'), covering the basic Latin
character set. The characters are ordered according to the Unicode standard.
See the documentation for more information.
-->
<CharacterRegions>
  <CharacterRegion>
    <Start>&#32;</Start>
    <End>&#126;</End>
  </CharacterRegion>
</CharacterRegions>