I found a workaround at http://askubuntu.com/questions/584922/how-do-i-fix-fonts-not-rendering-and-missing-letters.
The bug is described here: https://bugs.freedesktop.org/show_bug.cgi?id=88584
I found a workaround at http:// askubuntu. com/questions/ 584922/ how-do- i-fix-fonts- not-rendering- and-missing- letters.
The bug is described here: https:/ /bugs.freedeskt op.org/ show_bug. cgi?id= 88584