Hey Mirmathrax !
I had a simmilar Problem with the Developer Board -
Ros Indigo Desktop problem on Astra Developer Board.
After Installing Ros Indigo, The Symbolic Links to the OpenGLE Graphic Driver were changed.
I pointed them to the orginal ones again so both ROS & OPENGL Samples worked.
I am wondering if the X11 ARM Mali760 Graphic Drivers are built in the Lubuntu Distribution on the persee.
Or if its our job to check them from here ( http://malideveloper.arm.com/resources/drivers/ ) and get them working…
So also in a fresh Lubuntu Start of the persee i don’t get WEBGL working in the chromium Browser, in android it was possible.