title: flying-saucer-pdf Table 'name' does not exist in exception on ubuntu
body: <p>I have a simple spring boot web app, where i create downloadable pdf with <a href="https://github.com/flyingsaucerproject/flyingsaucer" rel="noreferrer">flying-saucer-pdf</a> from html that i render with thymeleaf. It's work well and generate the html string correctly. I develop on windows and during develop generating the pdf is also works well, but on ubuntu server don't work.</p>
  
  <pre><code>    ITextRenderer renderer = new ITextRenderer();
      renderer.getFontResolver().addFont(fontFile, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
  </code></pre>
  
  <p>fontFile is exist, on ubuntu too, it's accessibly by the program, and can access it, but when i want render a pdf i got the following exception.
  I have no ide what actually it means. </p>
  
  <blockquote>
    <p>Caused by: com.lowagie.text.DocumentException: Table 'name' does not exist in
    /opt/RFIT/TextileApp/conf/font/Rubik-Regular.ttf
            at com.lowagie.text.pdf.TrueTypeFont.getBaseFont(Unknown Source) ~[itext-2.1.7.jar:na]
            at com.lowagie.text.pdf.TrueTypeFont.process(Unknown Source) ~[itext-2.1.7.jar:na]
            at com.lowagie.text.pdf.TrueTypeFontUnicode.(Unknown Source) ~[itext-2.1.7.jar:na]
            at com.lowagie.text.pdf.BaseFont.createFont(Unknown Source) ~[itext-2.1.7.jar:na]
            at com.lowagie.text.pdf.BaseFont.createFont(Unknown Source) ~[itext-2.1.7.jar:na]
            at com.lowagie.text.pdf.BaseFont.createFont(Unknown Source) ~[itext-2.1.7.jar:na]
            at org.xhtmlrenderer.pdf.ITextFontResolver.addFont(ITextFontResolver.java:201)
    ~[flying-saucer-pdf-9.1.6.jar:na]
            at org.xhtmlrenderer.pdf.ITextFontResolver.addFont(ITextFontResolver.java:193)
    ~[flying-saucer-pdf-9.1.6.jar:na]
            at org.xhtmlrenderer.pdf.ITextFontResolver.addFont(ITextFontResolver.java:188)
    ~[flying-saucer-pdf-9.1.6.jar:na]
            at hu.rfit.textile.service.impl.PdfPrinterService.printPDF(PdfPrinterService.java:53)
    ~[TextileApp-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT:4749]</p>
  </blockquote>
  
  <p>on some forum they said i should add the font to /usr/share/fonts dirt, and re build the font cache. But it's does not work. </p>