Problem with the font tipographi of the program

Hi for all! This is my first time in the forums of unrealengine and, i don’t know if this post is correctly posted in the correct forum, If this post has not been published in the right place i apologize.
I have UE4 in Windows 7 and the program function me perfectly, but, today i decided install Unreal Engine in Ubuntu 14.04 LTS and after see this video i ran the program, but when the program finished of load, i see that in site of the option’s name appear white squares.

I wait that somebody help me please.

In this screenshoot, you can see this problem: