Inside a running Mathematica kernel define map1=Uncompress

Inside the file there is a string CompressedData.

Go to the directory /usr/local/Wolfram/Mathematica//SystemFiles/FrontEnd/TextResources/.

Let's say your installation of mathematica on linux is in /usr/local.

The extra steps we need to configure Mathematica not to use special font for greek are needed because the new file is compressed with an internal algorithm of Mathematica:

The new configuration of Mathematica stores the font mapping of special characters to a file. The result is a really awful rendering of greek fonts. So when you use greek characters in strings on linux, in Graphics or Graphics3D objects the font used is not the custom one you specify. From v.10 and above due to an alteration of the config file system in Mathematica you have to follow the solution of this article. The workaround described in the above article solved the issue of greek letter bad rendering in text to old versions of Mathematica. As already described in Mathematica and greek letters (v7 and v8), if you use greek language for text, Mathematica handles greek letters as special characters, because greek letters are important to mathematical expressions.

Greek letters mathematica