the following steps:

1.copy all Chinese fonts from Windows OS to the appropriate folder in Ubuntu.

cd /usr/shar/fonts

sudo mkdir 11

sudo chmod 755 11

cp “the fonts” /usr/share/fonts/11

2. Build fonts cache,

sudo mkfontscale

sudo mkfontdir

sudo fc-cache –fv

Then reload the system. Now you fix it!

upload a PDF document to BigBlueButton. Using PDF the document converts directly to SWF and there is no need for font substitution on the BigBlueButton server. In short, whenever possible, use PDF.