Added how_to_run_apollo 2.5_with_ubuntu16 document

docs/howto/how_to_run_apollo_2.5_with_ubuntu16.md

+# How to Run Apollo in Ubuntu 16 (Apollo 2.5)
+
+We recommend to use Ubuntu 14 for Apollo. For the user using ubuntu 16, here is the extra step you have to follow to run Apollo 2.5 under ubuntu 16. 
+
+
+1. You need glfw 3.2 and above, which supports EGL and run-time context creation API selection. (Refer to http://www.glfw.org/docs/latest/news.html)
+
+Installed the version from https://launchpad.net/ubuntu/+source/glfw3.
+
+2. Add following one line in glfw_fusion_viewer.cc:
+
+glfwWindowHint(GLFW_CONTEXT_CREATION_API, GLFW_EGL_CONTEXT_API);
+
+(in GLFWFusionViewer::window_init() before the glfwCreateWindow() call)
+ 
+
+With this, the perception_lowcost_vis finally works on my machine without a segfault.
+ 
+The issue comes from some behavior changes in the latest nvidia driver and a glfw bug mentioned in http://www.glfw.org/docs/latest/window_guide.html#window_hints_ctx:
+
+              “On some Linux systems, creating contexts via both the native and EGL APIs in a single process will cause the application to segfault. Stick to one API or the other on Linux for now.”
+
+So, with the driver (on Ubuntu 16), glfw_fusion_viewer needs to be set up to use EGL_CONTEXT_API instead of the default NATIVE_CONTEXT_API to evade the segfault.
+
+We plan to update the Apollo docker to support these.
\ No newline at end of file

docs/quickstart/apollo_software_installation_guide.md

@@ -117,4 +117,9 @@ Don't forget the
     bash docker/scripts/release_commit.sh
     ```
 
-7. Start your favorite browser (i.e. Chrome) and with URL: http://localhost:8888
\ No newline at end of file
+7. Start your favorite browser (i.e. Chrome) and with URL: http://localhost:8888
+
+## Run Apollo 2.5 in Ubuntu 16
+
+Please refer to
+[How to run Apollo 2.5 with Ubuntu 16](https://github.com/ApolloAuto/apollo/blob/master/docs/howto/how_to_run_apollo_2.5_with_ubuntu16.md)