osm tile server character display problem

Hi, I’ve configured a tile server on ubuntu. The map tiles are served correctly (but slow). The problem is that the non-English characters on the map are rendered as an empty block. What configuration do I need to do to display Chinese characters correctly?

I figured it out.

sudo apt-get install ttf-unifont

Edit /etc/renderd.conf

Edit /etc/mapnik-osm-data/inc/fontset-settings.xml.inc

service renderd restart

Clear browser cache.

Now I can see Chinese characters rendered correctly.