This question was posted a while ago, but I figured I post an answer in case anyone else stumbles upon this issue. I had this same problem on Linux Mint 18.1 with both Maple and Matlab installed. As you can see from the backtrace, Maple is trying to use the MATLAB libfreetype shared libraries for some reason. This Matlab-related answer worked for me: https://www.mathworks.com/matlabcentral/answers/348707-simulink-welcome-page-doesn-t-open-on-linux. Simply backup the libfreetype.so files in the Matlab directory, remove them, and make symbolic links to the system libraries (e.g. in /usr/lib/x86_64-linux-gnu/). If you can't find your system libraries, find their installation location with "dpkg -L libfreetype6".