Others have reported the same error - 'Illegal instruction (core dumped)' - on the Librealsense forums when trying to use the pre-made build but were able to build from source like you. From what I can gather from the post linked to below. the latest version of the SDK (2.10.2) has some issues with Up Boards due to a change the developers made, and they are looking to fix it. They recommended using 2.10.1 in the meantime.
That was 11 days ago. Several days ago there was another related case.